Malicious PDF — malware analysis report

Static analysis result for SHA-256 4310111d8d329ca4…

MALICIOUS

PDF

78.8 KB Created: 2020-07-08 16:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 76de3136c102764d7adc3d3bf0d2975e SHA-1: edf5595b2483448ab4031c6812b49c0e751953a3 SHA-256: 4310111d8d329ca446c5f585a0e283d0bda160228717b7c1900b725819f89aee
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://ttraff.com/wb?keyword=english%20to%20kannada%20grammar%20pdf%20download, is identified as a malicious redirector. The document body text, though partially corrupted, also contains this URL and other PDF links, suggesting a lure to drive traffic to potentially malicious or unwanted content. The presence of a link farm and a malicious redirector indicates a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=english%20to%20kannada%20grammar%20pdf%20download In PDF document text
    • http://files.smartlinkhomes.com/uploads/1/3/2/3/132302810/3565043.pdfIn PDF document text
    • http://files.liquidsunshinedesigns.net/uploads/1/3/1/6/131606644/6427307.pdfIn PDF document text
    • http://files.livingstonslittlelearners.com/uploads/1/3/1/3/131398134/polevobomifopidif.pdfIn PDF document text
    • http://files.pst4y.org/uploads/1/3/0/7/130738814/piwagitasesesuwatug.pdfIn PDF document text
    • http://files.bellaspeechsensoryworldinc.com/uploads/1/3/2/6/132695839/7603869.pdfIn PDF document text
    • http://files.thesanctuaryatmn.com/uploads/1/3/1/8/131856184/d83262d07.pdfIn PDF document text
    • http://files.rivermenrodandgunclub.com/uploads/1/3/2/3/132302973/nomegariwutok-wibiwu-visinatixubuj-sojimuta.pdfIn PDF document text
    • http://files.dunedinhempcompany.com/uploads/1/3/1/4/131438150/gepofiraledoju.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sezorez.files.wordpress.com/2020/06/86415344752.pdfIn PDF document text
    • https://vozomurazawi.files.wordpress.com/2020/06/rabulevotokobupum.pdfIn PDF document text
    • https://dipirikufuda.files.wordpress.com/2020/06/xaperiwimufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00009e09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9E09 32828 bytes
SHA-256: 181f30eb86c600fb8305d6f9106549382c57ed0411cc3921da9c26e716463461
font_00_sfnt_off00008c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C60 5236 bytes
SHA-256: e3de7dc4810564036c06d619a7fc1da3337dd59ca8181fc1171d0cf2cc70a335
font_02_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 3056 bytes
SHA-256: 9eb194e92d0f180e20bfe3f11cac01a82865a2254a5232c4214b5686058972dd
font_03_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 16496 bytes
SHA-256: 76c6a993a528be2c912a5735a233ece5595b74e6b11212dd1e24a0b75e3fc962
font_04_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 16088 bytes
SHA-256: fff8b70d67420864e2a263fdbbaad35efae781e73a516d3cf38207748e8715b5

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