Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e55214da2cf2a1f…

MALICIOUS

PDF

53.5 KB Created: 2020-08-06 13:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311e0bd2497bdf495df9200a06dcfc72 SHA-1: 5d9df53720e21cc870c75251559e81e75e6b28f0 SHA-256: 5e55214da2cf2a1f0f86e7452d019f9fd9f3ccfacc69b24ae25a5f54cbd31d92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards a malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=amrita+pritam+poems+in+english+pdf
    • http://files.maximus-ed.com/uploads/1/3/0/7/130775503/f94ed145dfb40a.pdf
    • http://welipag.mrseitner.net/uploads/1/3/1/3/131380429/dagutirag_fokumuwa_nexekipupojibi_fizomoseli.pdf
    • http://files.ignaciocarballo.com/uploads/1/3/1/1/131164112/1998454.pdf
    • http://files.obxchirothrive.com/uploads/1/3/0/8/130813524/kaziponowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0435/5814/2120/files/34557512245.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/84943088959.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/pem_to_pkcs_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/42601526633.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3934/files/63886198401.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/jovojozo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0785/2192/files/fijavazelenagopaxobapuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/53805385384.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/gungeon_high_kaliber.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/vatewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/gezepimakizarepusopazep.pdf
    • https://pixabay.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008405.bin
5b35c8d77e3553b032cedf2e0e93d68b8d4657992b0869789da00f59d8bef6d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8405 5444 bytes
font_01_sfnt_off00009658.bin
5cd023da7044fa3ad8eb5f6488588ac671aaf2261efe9728b1eb4c50fb85c10d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9658 10332 bytes
font_02_sfnt_off0000b9a6.bin
733a0b3cab0a19eb552ca82333052b819e5f072fbbf086f0ca718283b93f4858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 3916 bytes

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