Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f7c870b806765f…

MALICIOUS

PDF

69.5 KB Created: 2020-10-28 14:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: eff761a9e27fdf042bb481c720666da7 SHA-1: bee141d4fa992198cc4678e6ba7e14ae210111e3 SHA-256: 57f7c870b806765fac79618a130714a9119cade9538d6fb398bd201dad03667e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.link/pify?keyword=colores+en+espanol+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_5f8fbd3ec5219.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/6037640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f948ebe45298.pdfIn PDF document text
    • https://setumimirakav.weebly.com/uploads/1/3/2/6/132681532/kudemogebi_felovubapus_gekewa.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/3347499704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93576864-b0e9-43d9-9894-fab4163fc43e/20694324928.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/fowajozadejesukanale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a5da9e-ffcc-4bfb-8cd3-33dcd1ecaf39/fudofetur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7941/0862/files/destiny_2_ikelos_weapons_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/jewelifetis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/nefijadowiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec53f06-5d40-4da9-b373-2cae76330953/11876462189.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/anglican_church_of_southern_africa_lectionary_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/english_grammar_tenses_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/bujegibidibesigamuginesul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6991/3753/files/gwx_70_installation_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2905/4118/files/wedding_dress_with_detachable_skirt_kleinfeld.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8160/6335/files/murizujetomipegetif.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 4968 bytes
SHA-256: 7b54648839961b4cf2886af993d2a5adc753a0c1707d81701f76d3c06f7a1f6d
font_01_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 11312 bytes
SHA-256: 45d2105968ecfc119c19adea590e6b2bf5763a3e675675de6a523297a25dca79

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