Malicious PDF — malware analysis report

Static analysis result for SHA-256 137873e1bfa992be…

MALICIOUS

PDF

45.5 KB Created: 2020-08-18 13:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e25d7da6a0b85286874c4f753ae1be SHA-1: 8f62b0d0fe44cf30d7cdc4eb5035daeeaf4e33ed SHA-256: 137873e1bfa992be362a5a7dccfb5f8fc4d27a25baa5faa0906574dc4157657d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical link directs to 'ttraff.com', a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect users to potentially harmful 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.com/pify?keyword=usg+guided+supraclavicular+brachial+plexus+block
    • http://dotuzaga.bethlehem505.org/uploads/1/3/0/7/130739967/9725072.pdf
    • http://files.bridington.com/uploads/1/3/1/4/131407974/2920628.pdf
    • http://files.debbybolandwatt.net/uploads/1/3/0/8/130814758/d39288f16a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/sovasus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/vitamina_d_alimentos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/bopefijajidep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/mofikoluvoxazuvorifajop.pdf
    • https://cdn.shopify.com/s/files/1/0437/7034/7677/files/saxogosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/37037550314.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/95321569402.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/57531279011.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/thai_horror_movies.pdf
    • https://cdn.shopify.com/s/files/1/0440/8328/2070/files/remdio_caseiro_para_cseos_amigdalianos_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5481/files/dusefosutewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/31945076451.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_off00006a92.bin
806c823e1d74969c7e38572601a0ffd39d56f5e31217a1d969702342733d4701
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 5656 bytes
font_01_sfnt_off00007dd1.bin
00442f2325d9fe74fc1ceada456dc3b13adadbc7fdf1733858d7b6b805ed7d91
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD1 13736 bytes