Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ff0257b3efba8e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-05 11:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d171fb5c392575be9aeec17ee437b100 SHA-1: 46c2fcdfa1a4f98e72b29caaa0868431c3487155 SHA-256: 37ff0257b3efba8e2a33756dcdd41c91eb8f8fb493f436321a3dd9c5b7a18e18
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, with numerous embedded URLs pointing to various Shopify and other file hosting domains. The primary malicious URL identified is https://ttraff.ru/pify?keyword=california+dmv+handbook+2020+pdf, which likely serves as a gateway to a malicious payload.

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=california+dmv+handbook+2020+pdf
    • http://files.fourseasonsbooks.com/uploads/1/3/0/7/130740073/4b2a050.pdf
    • http://files.teesreef-aquatics.com/uploads/1/3/1/4/131406390/f7b9bf1.pdf
    • http://files.lacoachusa.com/uploads/1/3/1/3/131380485/1016375.pdf
    • http://files.jazzmenmusicandgallery.com/uploads/1/3/1/4/131411199/nefakexopodebu-navidejeki.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/35150395864.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8170/files/duwexiwuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/futake.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/67742547377.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/94401373689.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/15536720236.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/dolemawufikabilamegerudu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/94712659214.pdf
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/parasanefiwonulifufose.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/5236520766.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/barojogis.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_off00005a4b.bin
847121b9a1cc9551a6d52cd7407f47e739ef89be0b6b6561cb0780268427a864
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4B 5548 bytes
font_01_sfnt_off00006cfe.bin
fbfc10279de5943e294931ed86b5245ea0a83c2600fa84ce846ba36ac479d94d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFE 10420 bytes