Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a85cad97199868e…

MALICIOUS

PDF

38.4 KB Created: 2020-08-22 08:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e862bc4f7cd8d5a241b7032fa3e085 SHA-1: da755c55d6daecd7372bb58978afa09c1fb094f1 SHA-256: 7a85cad97199868efde3957a56c48502212155f8b6890f36b944be8c5873957f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text fragments suggesting a fake registration form, likely intended to trick users into clicking the malicious link. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=ahpra+general+registration+form+psychology
    • http://files.sandrastudioone13.com/uploads/1/3/2/3/132302780/takiba.pdf
    • http://guzapu.mastermindforce.com/uploads/1/3/1/6/131637316/xulizavapisaloteva.pdf
    • http://files.aimeekalmus.com/uploads/1/3/0/8/130814758/dufofosugar.pdf
    • http://fulifakij.birthbeforeandafter.com/uploads/1/3/0/8/130814229/pimelobi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/63384266769.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/dulas.pdf
    • https://cdn.shopify.com/s/files/1/0444/5303/6199/files/pharma_analytical_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8565/0325/files/oxford_bookworms_library_starter_drive_into_danger.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/spongebob_squarepants_movie_kisscartoon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5393/1944/files/repetytorium_angielski_sownictwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/jiwediduwereros.pdf
    • https://cdn.shopify.com/s/files/1/0451/3693/7125/files/line_break_remover.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8284/files/kulunemadoveleliwobujafar.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/porsche_944_wiring_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/daxakesapejilejulivo.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_off00004a14.bin
a1250d3f62bf8d0bf067a1cae3cec633f49433aab19548419a1e3986d1ff0aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A14 5308 bytes
font_01_sfnt_off00005bf6.bin
c808942f2926f026980c827f52961bbe431c131b587bea5a04fdb5b5bf111c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF6 10004 bytes
font_02_sfnt_off00007e3f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3F 4324 bytes

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