Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8d5456e5c79dca…

MALICIOUS

PDF

48.4 KB Created: 2020-08-03 08:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08278f5e70c1d9fd474a477e96960803 SHA-1: 0017e4988b0d832737248684c97f00de87024fd7 SHA-256: fc8d5456e5c79dca0b8b505dd515388807220e5ebe030e85343f53f3cf1ab3ea
152 Risk Score

Malware Insights

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

The PDF document is designed to appear as a search result for a textbook, but it contains a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous links, many of which point to Shopify domains. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload execution.

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=mcgraw+hill+physical+science+textbook+pdf
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdf
    • http://files.millcreekscattledogs.com/uploads/1/3/0/9/130969370/fakezavegafiropelim.pdf
    • http://files.mvchoir.org/uploads/1/3/0/8/130874073/8189692.pdf
    • http://ritaso.project907.com/uploads/1/3/1/1/131164312/merapo_likawinadud.pdf
    • http://files.venturecreationcafe.com/uploads/1/3/1/4/131453251/3603287.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/bepikibezufinases.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/how_to_become_a_better_programmer.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/29910014611.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/23450251366.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/nelajofafaxowufejobi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7440/files/wapixulifilolebom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/aeon_trinity.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/22798470834.pdf
    • https://cdn.shopify.com/s/files/1/0435/9274/5117/files/wewatogexoviza.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/bubidaborikoxowazax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72163988246.pdf
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/74120943298.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejotoxirebogoro.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/98172563432.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_off00007a1d.bin
c50a25a6ac68b3d71b09de9285c21df5b0227ef6b4c46996f33beafc3dc713d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1D 5888 bytes
font_01_sfnt_off00008e48.bin
5edc1de757ede448b77c6b3adf331b97fb871253116fdb67cc125075c206fc15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E48 11176 bytes

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