Malicious PDF — malware analysis report

Static analysis result for SHA-256 756fda3c2544fd99…

MALICIOUS

PDF

56.1 KB Created: 2020-08-06 20:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72d7a50600f71faec6f637ff7c398987 SHA-1: 3aca9b042357dc429cb813802989ce0e5b1658de SHA-256: 756fda3c2544fd99fe8fa1149bd0a0539a2ef645f7eef823897b93fa968225e6
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though partially corrupted, suggests a 'promissory note' lure, aligning with the 'SE_INVOICE_LURE' heuristic. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content or engage in SEO manipulation for phishing. No scripts were extracted, but the primary malicious indicator is the redirector URL.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=promissory+note+pdf+format
    • http://files.breakingbadluigistours.com/uploads/1/3/0/8/130813851/5362696.pdf
    • http://files.steelpassport.com/uploads/1/3/1/4/131483002/nibuzuperinoze.pdf
    • http://files.mhecblacon.com/uploads/1/3/1/4/131437351/vasak.pdf
    • http://files.musicboosterswinters.org/uploads/1/3/1/0/131071067/gikoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/70257564954.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/4615631258.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/building_materials_handwritten_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0436/1895/files/26257402530.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/cbse_board_exam_date_2020_class_10_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/9848/6424/files/zaxavovilemaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3622/files/xiwanaxaguxagupozin.pdf
    • https://cdn.shopify.com/s/files/1/0440/7898/9462/files/74784186147.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/xenasajutomexiwor.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/sotikujapulalidutena.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/24887306437.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/93116128261.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_off00008ff9.bin
87992982b14b79571a8078c028beabd9c8c4e2ace25975e064259709595f98aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF9 5048 bytes
font_01_sfnt_off0000a107.bin
102dd1a2d931fff8ffe0827242ee0e35515247f1e1c4dcb5d5157f775bbaf731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA107 10548 bytes
font_02_sfnt_off0000c506.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 4324 bytes

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