Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db4f915970b3af…

MALICIOUS

PDF

43.2 KB Created: 2020-08-18 23:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4129e4cf96465a8e0010af86271b185d SHA-1: 1a33421a5d1aa438765f1ef1ab53627b5da45731 SHA-256: 70db4f915970b3af86e5072d8ae9dc85d032d6325d701fc5eeeb66b4483638fe
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. Crucially, one of the embedded links directs to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=birdsboro+climbing+guide+book
    • http://guvedufa.pro1inspection.com/uploads/1/3/0/7/130775075/4805521.pdf
    • http://dulunogew.muscularinjuryspecialist.com/uploads/1/3/1/4/131454526/lorimija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/blessings_in_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2965/files/attestation_sur_l_honneur_990i_carac.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/68361749382.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/gevonadubebel.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/wafibu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8308/8547/files/tikonaso.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/zugikopijaxilu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3215/files/migonedaravu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/barbarians_of_lemuria_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/8617087331.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/calculus_for_gate.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/93944871852.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/wosorajojomu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b69.bin
278ebdf90715fb6ee65feb40cecd3b23b0310a5a7a2055b00a7c08a7b99a2ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B69 5300 bytes
font_01_sfnt_off00007d57.bin
0e13c7e194fdeac77945bd0477ecde15b51ee4a96a8524926999ccf1afc0228c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D57 10184 bytes