Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5057bf5db2f677b…

MALICIOUS

PDF

51.5 KB Created: 2020-07-30 02:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 43a603c6ad88e12dd6f8f9abd82d99db SHA-1: 287bee715d9ba50c7403adc5a04b4b68d1a2d2d9 SHA-256: a5057bf5db2f677b05c055ffd88a35c02540119c88faadab47b5b12ad6e97857
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=all+about+me+writing+template+pdf In PDF document text
    • http://files.kelleygrantbooks.com/uploads/1/3/1/8/131856919/busemawen_jabam.pdfIn PDF document text
    • http://files.silvermichaels.net/uploads/1/3/2/7/132740871/7359469.pdfIn PDF document text
    • http://files.davescucina.com/uploads/1/3/1/3/131383493/1817930.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/1/0437/2522/6152/files/wolojiperulosex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/dugakofop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/kawijudominaloxoxofada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/pupagek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4096/3750/files/45638152819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/27602104080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/18386952098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/zewele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/fubovasegox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.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_off00008c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C55 5284 bytes
SHA-256: 51eb46a825dfdef8a6034e76f906bb5cd8e13faa15182b271bfc7c62ba202970
font_01_sfnt_off00009e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E42 10272 bytes
SHA-256: 2c3a8a113a0d82c0ff5bfc5504f3cf577c999b81bf6e6e72c3606c9769e4ab3f

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