Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f46188b49d35eb…

MALICIOUS

PDF

31.3 KB Created: 2020-08-17 11:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40aca8051ba0c8837342def13a5a008c SHA-1: 5df3e4014cccf01b82a47afb1fe5a3180d4633b3 SHA-256: 06f46188b49d35eb2e318ecc7b5cd97efbc74b93badf6c1c7dd935f271976253
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=mixed+tenses+exercises+with+answers+doc
    • http://legow.eastonfamilyfun.com/uploads/1/3/1/3/131381464/2383950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/pathfinder_core_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/vuxiwejuzowut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7306/0520/files/analise_swot_exemplo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/bottom_bracket_cable_guide_trek.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/cancer_medular_de_tiroides.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/76184932547.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5224/files/lorojibariwij.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/14821662314.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/muzavipupumilo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/jojilafukufupugokuxasux.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_off00003f54.bin
265b4727ad904e896ee79ee23fa2efc1b513199e7edde90900147455b22adafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F54 5160 bytes
font_01_sfnt_off000050ef.bin
82eb00471ec40caf54093c8ca2835420df4e2f3c9f235971846f13cc1ea6552f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50EF 9236 bytes

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