Malicious PDF — malware analysis report

Static analysis result for SHA-256 875e120444fc03fd…

MALICIOUS

PDF

39.9 KB Created: 2020-09-11 23:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7723d681b2c96f3ebb5c86947929136a SHA-1: 6d70c6ae2d37f335126def0667d3014ff4f33544 SHA-256: 875e120444fc03fd7eb38cc1104982b0523d1860300a51f9246d089ed0a35e78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or content distribution tactic. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious redirector URL is a primary indicator of malicious intent.

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.me/wix?keyword=4+drunkard%2527+s+path+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0d089b_a093cc9a53b545aaa9cfed16b686c1ca.pdf
    • https://static.usrfiles.com/ugd/405339_7e95c060eaca4d4089057de53eb615af.pdf
    • https://static.usrfiles.com/ugd/a31856_00c80320728943659b422985ca75964e.pdf
    • https://static.usrfiles.com/ugd/865d50_c6d29dc34fea4e2987a468f9c156ea49.pdf
    • https://static.usrfiles.com/ugd/6da380_0fe6411eaf7c41f8811d07de7f7d5bb8.pdf
    • https://cdn.shopify.com/s/files/1/0432/4350/3783/files/code_produit_sims_3_origin_crack.pdf
    • https://cdn.shopify.com/s/files/1/0434/9617/7816/files/67014986659.pdf
    • https://cdn.shopify.com/s/files/1/0437/0143/6566/files/85938698950.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/43234614792.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/68337658171.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/anemia_drepanocitica_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/8649649907.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/walmart_usa_apparel_testing_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7230/4790/files/diwikesokogakodijegub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/jemopowimobipaxigif.pdf
    • https://cdn.shopify.com/s/files/1/0429/1294/0188/files/29604137470.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_off00005d6c.bin
08e2d490d02c4641cfe4cbd6d8678c9b8184f234f9a6beb73c371bd7b6d4b879
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6C 5292 bytes
font_01_sfnt_off00006f46.bin
25559918caeb2a7759a9bc05eecc81f3b98850e246445e12e0bf2c26da4271d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F46 10440 bytes