Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf12bd939824520b…

MALICIOUS

PDF

51.2 KB Created: 2020-08-03 04:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: efaa096640093b82b89fc9b575ef70fd SHA-1: 2080b385a8f5a0ea1f2c229541e11848ee57c21c SHA-256: cf12bd939824520b255930e1c64f44af38752aab71b73c65c32b7d5aa4651b03
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=manhattan+gmat+6th+edition+pdf In PDF document text
    • http://files.marengofc.com/uploads/1/3/0/9/130969498/ce506e26a8e71.pdfIn PDF document text
    • http://files.josesaladbar.com/uploads/1/3/2/8/132815190/9880060.pdfIn PDF document text
    • http://files.manualhandlingresource.org/uploads/1/3/2/6/132682119/kinupam-mujiwamen-gemawivad.pdfIn PDF document text
    • http://files.khalsaacupuncture.com/uploads/1/3/0/9/130969885/1845010.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/1/0431/7279/0427/files/wuroxipopofedego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/83583068491.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/domek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6562/9077/files/96920538861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/33909203013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/kwikset_deadbolt_installation_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/84225136671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1812/5465/files/xugapatazuwem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/dizaxur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/zumdahl_chemistry_9th_edition_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9092/0099/files/13541091517.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_off00008832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8832 5308 bytes
SHA-256: b0117901d36a278545ddce3ba2a8299b129184fabef10551da001fbc4cfb3a7e
font_01_sfnt_off00009a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2F 11460 bytes
SHA-256: 658b20bac45d109dfa6381488a4164dc15738a81c4a76e7ef778ec0c43616912

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