Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcbb4922738b0b6…

MALICIOUS

PDF

43.8 KB Created: 2020-08-26 20:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db019da2a1c1189c65fa2a1a9ddc57e5 SHA-1: 01b4789d51ef66eaa2707ecc014be584330f113a SHA-256: 8bcbb4922738b0b666d73abe9a5916bba1bf3ef8622eb0efda8b75d4698fdc6d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure at 'ttraff.com'. Another heuristic noted a large external PDF link farm, with many links hosted on 'cdn.shopify.com'. The primary malicious IOC is the redirector URL, which likely serves as a gateway to a phishing or scam page.

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=the+negro+mother+langston+hughes
    • http://files.taohandpan.com/uploads/1/3/1/8/131871814/sizaduvar.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/55340717330.pdf
    • https://cdn.shopify.com/s/files/1/0441/2823/9768/files/39996439407.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7724/files/minions_full_movie_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/9655/5168/files/tektronix_oscilloscope_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/wipofava.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/rotoritofutese.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/68763065705.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/bengali_comedy_drama.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/lodunulapolezekedokan.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9461/files/24009060667.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/vorazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4386/3198/files/kg_to_lbs_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/96856261478.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed0.bin
71bbd37a1cfc94e5f360ffaa61855f723e231607106f5740a28dc7a6c8d54d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 5048 bytes
font_01_sfnt_off00007fc2.bin
c598b8cfdd89d48d7cf31dcaacaedc71aedf3ee475135b85a1e3bb09cb7e10b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC2 10116 bytes