Malicious PDF — malware analysis report

Static analysis result for SHA-256 028031db3b3bbaae…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 06:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f754db21026a56afff38d2a2938a735f SHA-1: 452fd3e7ad202dc362a5476c84453f36aadb8d71 SHA-256: 028031db3b3bbaae49971c02a7ab06febf126f41583a5de3f20c24eee274daab
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a holiday party invitation, which redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF was flagged for containing a large number of external links, suggesting a link farm or redirection tactic. No scripts were extracted, but the embedded URLs and heuristics point to a phishing or redirection attack.

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=holiday+party+invitation+template+powerpoint
    • http://xegidijun.thecornerofhealthandwellness.com/uploads/1/3/2/6/132681504/pebalisujesasu-lujonolulemafak.pdf
    • http://files.ratchfordrealestate.ca/uploads/1/3/1/4/131437515/pimakipisezamamixin.pdf
    • http://files.meganlamart.com/uploads/1/3/0/8/130874431/mawurodoketew.pdf
    • http://files.newqha.org/uploads/1/3/1/6/131606546/7679ec2bce.pdf
    • http://files.icewaterrecovery.com/uploads/1/3/1/3/131398219/jimurofelifux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/sepuzufaxinafelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2421/files/wazavapumakusefije.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22945880436.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/dulusaruxer.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1501/files/40473886664.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/ropudebew.pdf
    • https://cdn.shopify.com/s/files/1/0436/0303/4276/files/56268851276.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/elementary_statistics_larson.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/33541347893.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/kusigonopi.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_off00005e54.bin
705018e68fd94a1eed002c1754f5127d2d4ff261a79cc3acf87baa5f6ad3fd33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E54 5140 bytes
font_01_sfnt_off00006fd3.bin
6dc78557c64390d83778979452824823a5704e747c2c975f0a89030152fdf726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD3 9796 bytes

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