Malicious PDF — malware analysis report

Static analysis result for SHA-256 840cb695b033fbe0…

MALICIOUS

PDF

37.1 KB Created: 2020-08-13 22:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83d76c4dbdb2ba9defe0ea1d4bf01f1a SHA-1: d4e4c002e329cfa32517ba94f4b07543d9e2ecf2 SHA-256: 840cb695b033fbe0bd228ae62fdb9053e3013d90439ace9ac23ff40876007a91
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text and URLs that suggest a lure for users to download or access further content. The presence of a download button heuristic further supports this, indicating a phishing or scam attempt.

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.cc/pify?keyword=2+4+4+engineering+lettering+guidelines
    • http://zodaf.funkbusterbaits.com/uploads/1/3/1/6/131607131/lepekijuxa.pdf
    • http://xefijuzow.sdoster.com/uploads/1/3/1/6/131606289/segir_jugegi_kuluwukabezoto_zodajixa.pdf
    • http://files.dwidrugclasses.com/uploads/1/3/2/6/132695832/pusabotubekoxaxune.pdf
    • http://files.thecoolphotographer.com/uploads/1/3/2/8/132815882/919477.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/pedapugametu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/77999284663.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/how_to_use_moss.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/xusufinejafam.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/36723417956.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/baranenekenuzurifebugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/make_lemonade_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/anatomia_del_cordon_umbilical.pdf
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/laterally_unsupported_beams.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/51089103557.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/jopuxotefikofuvogivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/64780507566.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_off00005429.bin
c7ed0aa27a6267d98b986e14932af79b24d948bfb5c44013fd55a49e1af28018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5429 4908 bytes
font_01_sfnt_off000064ec.bin
5f1995b65ea5091980bf97d40413518ea71d43576ecf9aba73b068e6d9e305bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 10152 bytes

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