Malicious PDF — malware analysis report

Static analysis result for SHA-256 80168184c57f9a0f…

MALICIOUS

PDF

46.6 KB Created: 2020-08-08 15:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93e8b76c837761a26ea14beee2cb0676 SHA-1: a6c1ace14805b1a29c016d39e937bbbe1be4e274 SHA-256: 80168184c57f9a0f214f810920057eb31562e28ec7614b01cc0281d1663532c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by a machine learning classifier and heuristics indicating it's a redirector link and a link farm. The document body, though partially corrupted, contains a URL that points to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The presence of numerous external PDF links further supports the link farm heuristic, indicating a potential SEO abuse or content farm strategy to distribute malicious content.

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=list+of+fatty+acids+pdf
    • http://files.normawalton.ca/uploads/1/3/0/9/130969987/3292307.pdf
    • http://files.felonmentorship.org/uploads/1/3/2/6/132682802/lejawozazax.pdf
    • http://files.netcasters.net/uploads/1/3/2/6/132696483/wofitox_lixamiso_guwosa.pdf
    • http://jodom.hartosteopathy.com/uploads/1/3/1/8/131856772/2204086.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/garewosabumulezetu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/60142002205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45035229099.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/rrb_alp_cut_off_marks_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/30785003863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/edelbrock_carb_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5121/files/11845236368.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/wavibeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/31743776026.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/14420408309.pdf
    • https://cdn.shopify.com/s/files/1/0432/7014/4166/files/viviwomimemav.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/4259261214.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_off00007920.bin
7e34439c8ad57e7180a08ce5507259628695c1b12a922579575e553f60c6e0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7920 5064 bytes
font_01_sfnt_off00008a82.bin
7ffce525230728c2f7d917ba73969c62c57659e0a6065528d4976942d292f499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A82 10164 bytes

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