Malicious PDF — malware analysis report

Static analysis result for SHA-256 341c752e4becdf1a…

MALICIOUS

PDF

67.1 KB Created: 2020-08-09 11:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ed4f85d70b307b1eec464ec73ec3d37 SHA-1: 2086d0832808a3ceeb0928bd5e707c978e5874ca SHA-256: 341c752e4becdf1a98963c97ffa1ec0368a8ad76ecc1e7a7570c2dff20fb714c
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a download button heuristic further supports a malicious intent to redirect the user. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=biosensors+pdf+2020
    • http://rugip.looselucys.net/uploads/1/3/0/9/130969723/xixamanijadina-dudesagaxilig.pdf
    • http://files.paulinepeelconsulting.com/uploads/1/3/0/9/130969472/nomeripitijo_mugegibijemizid.pdf
    • http://files.carsagasfastlane.com/uploads/1/3/2/6/132682790/sivoriferejo_faxapeninavik_tevinopix.pdf
    • http://files.theteenspire.com/uploads/1/3/1/1/131164046/tutojiwido.pdf
    • http://piligefib.livelyimpact.com/uploads/1/3/0/7/130738970/nuneda_lipumuvaker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1384/7714/files/kejinukuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3823/6062/files/office_technician_exam.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/saturated_vapour_pressure.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/28032620817.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/zumaweko.pdf
    • https://cdn.shopify.com/s/files/1/0438/1310/9917/files/7977164183.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/historia_biblica_de_jose_completa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/tigonubo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/bixuremufufelozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/66797640221.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_off0000ca2c.bin
fa552878fbe69d60c7bc2bbafe5271cf7b16ca3b02fddbcf457a06e50e421746		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2C 5116 bytes
font_01_sfnt_off0000dbae.bin
cfe17a94d0f993d1350a04dacd2a345b09a8c8caa30236684248f05f6f33f1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10580 bytes

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