Malicious PDF — malware analysis report

Static analysis result for SHA-256 3475a801177715e0…

MALICIOUS

PDF

42.9 KB Created: 2020-08-19 03:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12951dd4d5a57357496603a55699cf38 SHA-1: 014f59cb43a964a1a01dab0e0fa51bfa47ba3674 SHA-256: 3475a801177715e0e59aa12e08c469ae3199968b4edb0af5d76e00a5f3bb2575
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=bible+apk+pro', points to known malicious redirector infrastructure. The document body contains garbled text, but the presence of numerous links suggests a link farm or redirection attack designed to lead users to malicious content. No scripts were extracted from this sample.

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=bible+apk+pro
    • http://files.letrim.com/uploads/1/3/1/3/131379301/92bec98f0.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/bratz_logo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/julugonirovipamipilezipez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/1265996123.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/rutowutajefaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/begevegibapobigenafibux.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/knock_out_drum_sizing_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3138/6517/files/ic_86_risk_management_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/bihar_tet_2020_english_question_paper.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_off00005e15.bin
33d3b5752ee2e0cf90e09c71b4203662b22847c9e85796de4468e8c4c825392d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 4888 bytes
font_01_sfnt_off00006ec1.bin
b6fd8eea22c533ca114912e3f6641387dac38785cc776ab26beea98e1581ff1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC1 15732 bytes

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