Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3801c047e862cbf…

MALICIOUS

PDF

40.8 KB Created: 2020-08-18 17:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36985b67d4ea0355e5606c9c971bef8d SHA-1: a6a0c1e0a75649d72f326bdc757adde4d8910bfd SHA-256: b3801c047e862cbfff83a8d129472788794970b769e001dc2a99810991ff6a71
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic 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.ru/pify?keyword=army+amino+for+bts+stans
    • http://refakep.acworthexpandinghorizons.org/uploads/1/3/1/3/131381204/1406900.pdf
    • http://zoferu.coloradoiscebs.org/uploads/1/3/0/7/130739240/a1fbd8fb5985.pdf
    • http://muduwo.goodbyehellocrafts.com/uploads/1/3/2/6/132681513/kowujasud-gikolel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/90462496913.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/pesawomalodarogatodur.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/pajibopabome.pdf
    • https://cdn.shopify.com/s/files/1/0437/7398/4919/files/4504032505.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/fagixuxinetaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/oxford_english_thesaurus.pdf
    • https://cdn.shopify.com/s/files/1/0437/9577/5650/files/jiritogebojeju.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5384/files/product_marketing_manager_resume_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/2228/4960/files/ba-_207_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/56479685157.pdf
    • https://cdn.shopify.com/s/files/1/0429/6146/9599/files/48498450177.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/tawusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9655/5168/files/22286098560.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049a2.bin
253c97b479fc401ea5cd23e563bc625d09eca99e4a56a6fc7034a5d65db65bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49A2 5112 bytes
font_01_sfnt_off00005af2.bin
20cd785e3c936d3f31f1b8ff550547d50db1ab42271474b586ee27d610937cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF2 9928 bytes
font_02_sfnt_off00007cb3.bin
99d50c4195ec1034dac579fedded64b8fc455db7f77d98627fad31e9cc07a68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB3 16920 bytes

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