Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcc0c4844dce3df…

MALICIOUS

PDF

51.4 KB Created: 2020-08-24 14:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd291fab0f2677f4767340494157bbe SHA-1: 7c0ad96c9a019f1bc68b576ebe078dd053b3b9fe SHA-256: 9dcc0c4844dce3df7e6d436d12bb5f6131d7c87c278c8288b1f2696f74e6f40d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=visual+studio+2017+shortcut+to+format+code'. This indicates a social engineering attempt to lure users to malicious content. The document body also contains this URL and numerous other links hosted on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=visual+studio+2017+shortcut+to+format+code
    • http://files.biblecodesrevealed.com/uploads/1/3/2/8/132814050/lubebasu.pdf
    • http://files.peldongaming.com/uploads/1/3/0/7/130775431/vawikapalujufukuzun.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/xijawewobeve.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/bejigirej.pdf
    • https://cdn.shopify.com/s/files/1/0435/2383/4011/files/diablo_2_druid_builds.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/behavioral_objectives_examples.pdf
    • https://cdn.shopify.com/s/files/1/0440/3360/5797/files/33291717623.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/23786838055.pdf
    • https://cdn.shopify.com/s/files/1/0432/7256/8996/files/bleeper_crossword_answer.pdf
    • https://cdn.shopify.com/s/files/1/0429/1801/9235/files/90974471328.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006399.bin
385a1c143c273a5091eb612f4390e40c358d8d8f543b59bb7c2b1f0b7617107f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6399 5632 bytes
font_01_sfnt_off0000769d.bin
62f798b014a7e3abbc2c41404a1d2c2775833fd6e6c01b9e88955aca839c2645
pdf-font-stream PDF embedded font (sfnt) at offset 0x769D 16164 bytes
font_02_sfnt_off0000a951.bin
a4f616c8ed03231f927c8f6725ddfb6aed79ba1e9c0c9257d690ec40f184d4cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xA951 16388 bytes