Malicious PDF — malware analysis report

Static analysis result for SHA-256 65db2b6553e5629a…

MALICIOUS

PDF

36.9 KB Created: 2020-08-02 05:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0697157901ab8890c03653e8d797381a SHA-1: b3c07124c9a682a7e395aeaca48718c06a6c7448 SHA-256: 65db2b6553e5629a05f0df81b7971d9c4a943f5e1fe3276396eee16fb649ac44
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO manipulation tactic to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=introductory+chemistry+zumdahl+pdf
    • http://files.moosemanormi.com/uploads/1/3/0/7/130740504/nejamavun_vopaleduwi_zopurikilogesa_nofoxepoma.pdf
    • http://files.wilmingtonlatindance.com/uploads/1/3/0/7/130739674/7462841.pdf
    • http://files.abocomix.com/uploads/1/3/1/4/131453215/4454693.pdf
    • http://files.orilliasilverband.com/uploads/1/3/0/7/130775965/8620610.pdf
    • https://www.nxtbookmedia.com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/76547466104.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/wetaniwakozaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2641/5779/files/larval_acid_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/pajasakufakojagidosene.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/zimowobutujejobetopeva.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/2645374979.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/gemaluwisisuxakifefavafi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4418/1928/files/xofeniwim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0438/4659/8821/files/68236265044.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/farezopinajusilavuxor.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_off00005143.bin
6ab4fd7dc7ebc669425b9883ae781cf473a6177c530b73873ee2d63dc0a56403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5143 5484 bytes
font_01_sfnt_off000063d2.bin
bf82c368ab2f215429947fb22906068d9778cdd3b512f42acf079f874a6e20e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D2 10196 bytes

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