Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a91854873f431fc…

MALICIOUS

PDF

55.8 KB Created: 2020-08-28 01:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7cc6ebf76585b7fbdf89c349aca7b86 SHA-1: e8f50020e17a672064c7189c93c18eec6aecb805 SHA-256: 7a91854873f431fcfc63004e89b58b9cf7896cefa029463425097a257baa2a3e
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are algorithmically generated and point to external PDF files, suggesting a link farm or SEO abuse tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=hibbeler+mechanics+of+materials+10th`, which is presented in the document body as a search result. This indicates a phishing or scam attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm behavior are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=hibbeler+mechanics+of+materials+10th
    • http://files.waiaholenurserygardenandfloralgifts.com/uploads/1/3/0/7/130775023/9425a7c704a.pdf
    • http://guwilubo.soniawilliamsart.com/uploads/1/3/1/4/131453133/wokuxafitiz.pdf
    • http://files.nationalchildrensdayuk.com/uploads/1/3/1/4/131409861/sevogixetomeroka.pdf
    • http://files.lamar58.org/uploads/1/3/1/4/131411199/fajizipibelaper.pdf
    • http://mitaf.exploratorypractice.org/uploads/1/3/2/7/132710712/d61cbd2ab20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/3724/6118/files/budowovitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/actuarial_formulae_and_tables.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/70648143733.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8888/files/22489159118.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/bojubemexebopewefamuziz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/dasubulute.pdf
    • https://cdn.shopify.com/s/files/1/0440/6237/6101/files/2018_calendar_template_september.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/36843652458.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/61774600309.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/50907192692.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e26.bin
40e6a0f2de50f5b1637eb7f400ed52807391fca9c074a9302ad875551436a125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E26 5204 bytes
font_01_sfnt_off00009f9b.bin
189959ac5bf99ff4ea713eb99cd5753c8d3b5ed15f5bb603cde9fc9b092d47d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9B 10508 bytes
font_02_sfnt_off0000c396.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC396 4324 bytes

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