Malicious PDF — malware analysis report

Static analysis result for SHA-256 e893f81a577d2599…

MALICIOUS

PDF

56.3 KB Created: 2020-08-04 15:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 235698bf19dac4a17524c16e516b7bcc SHA-1: caf13072c30c3757f338b922903f2f7d56db5c76 SHA-256: e893f81a577d25990c66cd03d52c49e22b76bd728e929b318740008c51d1a5c3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but also includes a critical link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though partially garbled, contains the redirector URL and several benign-looking PDF links, suggesting a lure to either phishing sites or potentially SEO poisoning to drive traffic to malicious infrastructure.

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=oxford+translation+pdf
    • http://tumizeno.vocations-sagesse.org/uploads/1/3/1/4/131438464/pigategetupulabas.pdf
    • http://files.alztrinbago.org/uploads/1/3/1/3/131380847/ff82b10ffd13.pdf
    • http://files.rottencollective.com/uploads/1/3/1/4/131409264/1c4e8d.pdf
    • http://files.4energia.com/uploads/1/3/1/4/131453132/1575242.pdf
    • http://metitej.bellaviratownhomes.com/uploads/1/3/1/6/131606165/07c99a.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/install_nvm_linux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/74733105486.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/10784778093.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/fazutofezuzinupepoliv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2518/files/56968141557.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/fewagonobenujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/pegaxewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6719/files/78676955713.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/17543493202.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/f350_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/osrs_cooking_calc.pdf
    • https://cdn.shopify.com/s/files/1/0428/9092/0099/files/tozuvikepofamel.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
stream_005_off00009fba.bin
65e3b42ce9412398249b443d1a051bfeb6452bfef7e1773bf92b2cf8a242cf3d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9FBA 29784 bytes
font_00_sfnt_off00006a28.bin
afe1b2035a4c8beb0e3feaa6233db276542e34dbf0dacb595ff3b2bcb1efdde0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A28 5132 bytes
font_01_sfnt_off00007bb0.bin
8fb8e85edb7442a68e412aa529c0e46e4a925a02d3ee53d79280e2fcef3c5cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB0 10484 bytes

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