Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23dbb0733e02cc6…

MALICIOUS

PDF

47.7 KB Created: 2020-08-23 06:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18137cd2a5262b19637ca8fc06460d41 SHA-1: 7b80112f4a43a68698aa32fdc5d932ba4dccc002 SHA-256: f23dbb0733e02cc6f30b9abf83e61086694acc93b2cf4d76c198e7d52d775d35
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=adobe+acrobat+reader+pro+9+free`. Additionally, it features a mass external PDF link farm, with many links pointing to `cdn.shopify.com`. The document body text also contains the lure 'Adobe acrobat reader pro 9 free', suggesting a social engineering tactic to trick users into clicking the malicious link. No scripts were extracted from this sample.

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=adobe+acrobat+reader+pro+9+free
    • http://files.mcgiverncarpentryservices.com/uploads/1/3/1/6/131637357/09f11.pdf
    • http://rupina.agnespoirier.org/uploads/1/3/0/7/130775164/mopujojiwomerujuke.pdf
    • http://files.roydonng.net/uploads/1/3/1/4/131483719/22a48.pdf
    • http://biziw.artwithmrssouth.com/uploads/1/3/1/4/131438563/zawodizutawamepomol.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6262/files/dudefamusilajaxad.pdf
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/minasulexivobow.pdf
    • https://cdn.shopify.com/s/files/1/0439/5981/2254/files/vubujumegofekilopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/59226188028.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/tor_browser_for_linux_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/mivasusowunuruzojomujidon.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4582/files/83362473513.pdf
    • https://cdn.shopify.com/s/files/1/0437/2152/3349/files/lepokirodaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c1b.bin
dad61f3e0bc55ebdce70c4492ebfbde4e79ebb42b5be3ba85620f89d8b18d12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1B 3076 bytes
font_01_sfnt_off0000670f.bin
c9b86f04c45995d0fbe9fd2a06276adc5d059f91e05dc2f4628461671f1e3750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670F 5224 bytes
font_02_sfnt_off000078e0.bin
52345a5123db03abeb414d5ccf00bca9e249af7d3c521e8d9d8662a1d391db7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E0 9888 bytes
font_03_sfnt_off00009aeb.bin
b88c55219ef84bd2ff48a12f23060c6b86d25efbafe4a8493ce51f9ac91249ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEB 16488 bytes

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