Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b98b8f32069bb88…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 00:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d11a3eca68a1b94d662425f0ac227903 SHA-1: 50ec54d58d2ed1d19d398669882b19748612aa5d SHA-256: 0b98b8f32069bb88fe47bb5e26e4d6ed5fed3ba38cdff842c7c2c38408cbeec9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector, which is a common tactic for distributing malicious content. The document body also contains numerous links to other PDFs hosted on Shopify, likely part of a link farm to improve SEO for malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to lead the user to further malicious sites.

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=little+house+in+the+big+woods+pdf+free+download
    • http://biwuroko.riefcanada.com/uploads/1/3/0/7/130739561/dilusorob.pdf
    • http://files.visionworksmultimedia.com/uploads/1/3/1/3/131379183/mivenuzigufogoweb.pdf
    • http://dafes.alliedavison.com/uploads/1/3/1/6/131606255/9352362.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/national_lampoon_s_barely_legal.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/21237602188.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/naruto_shippuuden_episode_77.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/corrupted_file_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/rijomobevojirorunevor.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/mujafawajokofanebenujijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/49277130652.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/maguleleremaxomokefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9605/files/ds3_ancient_wyvern.pdf
    • https://cdn.shopify.com/s/files/1/0430/0491/9971/files/java_aptitude_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0436/6182/0054/files/98198855370.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/chapati_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/15813071402.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_off000069b2.bin
0e29ca8d5573c9263f98804f90ff7f70d63029f3721b0cc84b0ae10107bf99ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B2 5476 bytes
font_01_sfnt_off00007c55.bin
2ea924ef0b9aae76e793062b8ca56c4b9f81eaa5ae4696709c56892e432e7e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C55 10112 bytes

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