Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5f8815a6eb36e0…

MALICIOUS

PDF

47.0 KB Created: 2020-08-23 10:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd170aabf8d0b19480a36aa9c78ec219 SHA-1: 4b9e8e32de6bdcd033811c2b66916eea59b0f2d8 SHA-256: af5f8815a6eb36e0a06b974942b43ecc222add9b6fa6e0dc17d901ab48b32b85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF document contains a malicious redirector link disguised as a Canadian passport renewal form. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL confirm the presence of a malicious link. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, contains the lure text and the malicious URL.

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=canadian+passport+renewal+form+2019
    • http://files.primrosevalley.tv/uploads/1/3/1/8/131871864/8864347.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3862/files/gusuni.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/waxal.pdf
    • https://cdn.shopify.com/s/files/1/0452/7859/3185/files/aimbot_fortnite_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/tujegesati.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/golujonapupaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/figurakij.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/66573257343.pdf
    • https://cdn.shopify.com/s/files/1/0435/4034/9082/files/kanisonitulinezanoju.pdf
    • https://cdn.shopify.com/s/files/1/0428/8879/0179/files/55992723911.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/kunepemewexezeruzavoguk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/10622672989.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/fototomewezawukixixi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/jarekoragu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8506/files/69067878156.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_off0000784a.bin
f42422b66ee71f3a83f0bb4efe53dc79d60f9e318fee5cf78992c811ed10fa8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 5668 bytes
font_01_sfnt_off00008b8c.bin
462125be7f6e23528e6657231e1f690ce1fb90f05ddf990b0ecfccb9050a4f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8C 10352 bytes