Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b79a3840f7e8790…

MALICIOUS

PDF

40.5 KB Created: 2020-08-16 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b4a133290cd4d7d0a5d3762195b18879 SHA-1: 352574065dde81f9334824feb016797208ea98d9 SHA-256: 7b79a3840f7e87904bfbf487682b0e2c9aa3d7a6d054281e341d82d5ec2dd0c0
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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=absence+form+lane+tech In PDF document text
    • http://files.jackinamerica.com/uploads/1/3/0/7/130775413/52e7553cdfc1d.pdfIn PDF document text
    • http://files.floridacraftychick.com/uploads/1/3/1/0/131070588/2346026.pdfIn PDF document text
    • http://files.nickpeciaro.com/uploads/1/3/2/3/132302858/jifixu.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/1/0428/8249/8716/files/71418593716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6054/4156/files/black_pipe_layers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2639/0933/files/star_wars_saga_edition_character_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0294/5959/files/24289373747.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/guxep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/jilorikuruxijexej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4659/9845/files/62170098745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/raxojex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/94539417112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3379/5477/files/neoplasia_endocrina_multiple_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0831/9907/files/mount_and_blade_fire_and_sword_mods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8696/2076/files/32492260850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/harry_potter_books_free.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_off00006142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 5248 bytes
SHA-256: 3f6daf6e2a426cb2a5c5041332538433c813f9ba046e8be2911eb9193e5d6027
font_01_sfnt_off000072e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 10140 bytes
SHA-256: 75bfa69f5e390d8d19e3d16302ba32c5164993a147342de0cf0dc58e0898fbe7

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