Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ff23f3bd0d4914…

MALICIOUS

PDF

54.5 KB Created: 2020-08-08 15:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57cb1802b99080be87f65b0f82af409d SHA-1: b6b623583b0e338792ecd07657cc401f38b4995f SHA-256: 63ff23f3bd0d491406d7a41dbd57750eb07e0aa257a77ec3a9071abbd84a31b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=knowledge+areas+in+project+management+pdf`. Additionally, it exhibits characteristics of a link farm, embedding numerous external PDF links, with `https://cdn.shopify.com/s/files/1/0436/9560/3862/files/bodybuilding_program_for_mass.pdf` being one example. 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.com/pify?keyword=knowledge+areas+in+project+management+pdf
    • http://files.deafcan.org/uploads/1/3/0/8/130874257/xevowen.pdf
    • http://files.outreachadvocates.org/uploads/1/3/2/8/132814996/4d259c6a528e29c.pdf
    • http://files.jeffdentonfit.com/uploads/1/3/1/4/131437318/zovujudilererogel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9560/3862/files/bodybuilding_program_for_mass.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/argelander_els_interj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/bubusarebowasonipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/65972337486.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/91834550033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vidabuvuwegorowomilamum.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/3ds_game_dumps.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4920/files/the_road_not_taken_explanation_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0434/2041/8198/files/logarithm_and_antilogarithm_table.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/lisubisojuvazel.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/fabitogagumegana.pdf
    • https://cdn.shopify.com/s/files/1/0429/0134/0319/files/49285745430.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7579/files/lotuzubo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009761.bin
a55384946f693fec3ea8b7809425ba428231402ac390f94c687940bb2eb37439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9761 5612 bytes
font_01_sfnt_off0000aa87.bin
c7cc0700ced34a7910415ef6bda3af58ae00cf0d8a5d948575a026690165eef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA87 9980 bytes

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