Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54c100255462945…

MALICIOUS

PDF

35.3 KB Created: 2020-08-26 06:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c03939e993a9179b56fc4a091f1e6a3 SHA-1: 121c2d6dc267e7828629e0e5e0ee91b8387d2339 SHA-256: a54c100255462945cb4d2da3f1e0e1b14197adfa18c6289c3019e4856de6319d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=rita+pmp+8th+edition+pdf`. This indicates the document's primary purpose is to redirect the user to a potentially harmful site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=rita+pmp+8th+edition+pdf
    • http://febemem.capstonelegacyscholarshipfund.com/uploads/1/3/2/8/132814930/sesisoviragaf.pdf
    • http://files.cottonthreads.net/uploads/1/3/1/4/131406269/1983182.pdf
    • http://bogaw.stonehengebelleville.com/uploads/1/3/0/7/130775162/kejijepudawufo_dufazukepulu.pdf
    • http://duwefefe.templemedsga.com/uploads/1/3/0/8/130873947/xepipokasuzudiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/33292529465.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/santander_budget_planner.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/81631573001.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/69804076383.pdf
    • https://cdn.shopify.com/s/files/1/0440/3304/8741/files/wokepuvirudekidesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/rudugosu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1571/files/nutunixagipoja.pdf
    • https://cdn.shopify.com/s/files/1/0430/4198/0567/files/wubejotogojomaritugozuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/trill_luv_yakki_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/wukiga.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1333/files/tefulosukirutefupobeve.pdf
    • https://cdn.shopify.com/s/files/1/0450/1697/3476/files/fresnel_s_biprism_theory.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a85.bin
a32c8819755bce1eb22ac55c55b6bd4139a9aea7823750c044925f907612e5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A85 5176 bytes
font_01_sfnt_off00005c04.bin
11e5ff1e774c2f03281c92ae057abf51bb09cdeeaa9ec493486d0e980608319f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C04 10192 bytes

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