Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bebb2412def155…

MALICIOUS

PDF

36.5 KB Created: 2020-08-31 15:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dedb5d0072eae2d4f52ba73cd0934bb5 SHA-1: 3cf22eca5afa424a6aeb6c19e0f6edd9c2eaa11a SHA-256: 16bebb2412def15522694e3f339be8d4fbf304992fbc937dafa8a06aa7ae71b3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=fos+agent+authority+form'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, flagged as a link farm, further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the redirector URL is the highest priority IOC.

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/wix?keyword=fos+agent+authority+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/78811240757.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/xowokudowanumetajuded.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/wofumegakomolodorixeke.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba5fa293ed1a4ec099233b8be7ab6b80.pdf
    • https://static.usrfiles.com/ugd/b8c837_5fc6c97f93bc4691a976cd63338b8b70.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/toyota_camry_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/patogenesis_anemia_defisiensi_besi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/19232916761.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3948/files/sears_craftsman_garage_door_opener_p.pdf
    • https://cdn.shopify.com/s/files/1/0435/8412/7135/files/jonogab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/juzigafugamanedijava.pdf
    • https://cdn.shopify.com/s/files/1/0440/7898/9462/files/gosukoxusekag.pdf
    • https://cdn.shopify.com/s/files/1/0447/6777/2821/files/fipotegolupapej.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_off00005340.bin
d5c246212b0bcf28245f0a64778f090af537e208d7d53a9dee8c3e162b89f810
pdf-font-stream PDF embedded font (sfnt) at offset 0x5340 5208 bytes
font_01_sfnt_off000064dd.bin
70f2de8da58e84de589169448f9c724895750b4dc8f7f37659ddddf9acbf01bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DD 9656 bytes