Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ecb9215097ffa1…

MALICIOUS

PDF

45.9 KB Created: 2020-07-28 01:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a62afd343d12ed5c75c485bf6cbff400 SHA-1: 23648b4ae98ca6e0b456c902df069411c8e04246 SHA-256: 98ecb9215097ffa13b2c752f5d6c3cb28c1bfadf45f9613b1a846341e1935d81
154 Risk Score

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.com/pify?keyword=criterios+de+busqueda+de+informacion+confiable In PDF document text
    • http://files.pozaproject.org/uploads/1/3/0/7/130776245/5615543.pdfIn PDF document text
    • http://files.blues-n-brews.com/uploads/1/3/1/3/131380052/jevefofed.pdfIn PDF document text
    • http://files.sufiireland.com/uploads/1/3/2/6/132682303/zikudafuja-welekufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/87139170785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/50459104281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/96242588168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/14141927520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4078/4035/files/fidijilomotuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9703/7730/files/fumufakerosuzekabonova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6955/2293/files/87731050469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/wikisapefodutodukilafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5588/1121/files/87956618188.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/93341015623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/19709882834.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_off00007238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7238 5336 bytes
SHA-256: f3c37cfed663d44451ecebd2913b5e83677325665a687ab102aa043d1c8b951e
font_01_sfnt_off00008440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8440 11216 bytes
SHA-256: be0bc3d781ca6718dd73504ae46529969f302f28a39907fac687e0fab9298d27

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