Malicious PDF — malware analysis report

Static analysis result for SHA-256 8034e1d62f1e9dca…

MALICIOUS

PDF

37.4 KB Created: 2020-08-12 16:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f6a682a8c8b51019b6e3be3ba98bb2 SHA-1: 14d5e7265372db192a9835232e0cf5318c27fac0 SHA-256: 8034e1d62f1e9dca8bd6ee0cacd76b20593fd545c50f876d6b010409486a359f
202 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector. The heuristic firings indicate the document is designed to lure users into clicking these links, likely to download further malicious content. The presence of a 'password-protected archive' lure suggests a multi-stage attack where the user is prompted to decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=nelson%20math%20grade%207%20textbook%20pdf
    • http://files.headrushtv.com/uploads/1/3/2/6/132681194/1635519.pdf
    • http://files.phemanitoba.ca/uploads/1/3/1/4/131438002/5152560.pdf
    • http://files.mail.rustictreasuresjewellery.com/uploads/1/3/1/8/131856698/1a4035f9e.pdf
    • http://dutesij.hostessjobitaly.com/uploads/1/3/1/8/131856772/zilapin.pdf
    • http://files.southwestcactusshop.com/uploads/1/3/2/7/132711999/e7b3dc9467d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/2919/6963/files/purepodaletenofomodirap.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/alleen_op_de_wereld_boek.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/xaxunukamigasu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9781/files/stoger_condor_supreme.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/vuzetizikixuridudipiri.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/agile_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/86325847632.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/persona_3_social_link_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/6757/8270/files/pavewavimutib.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_off000052d3.bin
7214ba9c04e1d5f378eb0a536790656ec934fd98c4593a2d75da160ebbc99b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D3 5776 bytes
font_01_sfnt_off0000665d.bin
9ed4d86f7bff97fd144ef0124297dcef54323b0be75c18748197c78a6ec37c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665D 10192 bytes

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