Malicious PDF — malware analysis report

Static analysis result for SHA-256 481a03494a5fac9c…

MALICIOUS

PDF

39.5 KB Created: 2020-08-07 06:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b16095a0ea052cd060e362fd679ca9 SHA-1: 69497ed6cf195cf0896eff6edfbaf679580ce731 SHA-256: 481a03494a5fac9c2b739f3caad7892c0c3b8198714960b605f4a9380ad8a9e5
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which point to potentially untrusted domains. The document body contains garbled text but includes the URL 'https://ttraff.com/pify?keyword=freund+mathematical+statistics+with+applications+7th+edition+pdf', which is identified as a malicious redirector.

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.com/pify?keyword=freund+mathematical+statistics+with+applications+7th+edition+pdf
    • http://wotew.vagalschwannoma.com/uploads/1/3/1/3/131384401/7436243.pdf
    • http://files.razorridgekennel.com/uploads/1/3/1/4/131452838/vimedi.pdf
    • http://files.zhuweiying.com/uploads/1/3/1/6/131637240/c822bfc4954.pdf
    • https://cdn.shopify.com/s/files/1/0435/1062/8511/files/actuarial_life_tables.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/78583699802.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/229258309.pdf
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/21074778055.pdf
    • https://cdn.shopify.com/s/files/1/0433/2938/8699/files/bodmas_worksheets_for_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/femitoravakipivigutajaboj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/benivat.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/96523881595.pdf
    • https://cdn.shopify.com/s/files/1/0436/8692/0347/files/86907704534.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/nino_rota_amarcord_partitura.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/76758135280.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/tupotona.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/opodo_ltd_paypal.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_off00005a83.bin
3c7958fefc807d84880e507afd64d2de125d848dabc4ffe47f4aceffc3e3f3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A83 5524 bytes
font_01_sfnt_off00006d3d.bin
8a3c0428116a253e5f8992b14cc27b612640731ac3d9c261106f39a64fbe2e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3D 10596 bytes

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