Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ff8c79cdb75638…

MALICIOUS

PDF

48.0 KB Created: 2020-08-01 20:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec72e3e8903746d8adccb2d58b3259f SHA-1: 54080f774d1fc1a84d72d72144a52135e496e5a5 SHA-256: 05ff8c79cdb75638b6b7a3e948ccf2466e6c9789cba98bece1c0948677681827
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external resources, including a critical redirector URL. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains text related to programming languages and embedded URLs, suggesting a lure to a malicious site. No scripts were extracted, but the presence of embedded URLs and the redirector link are strong indicators of a phishing or malware distribution attempt.

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=differences+between+c+and+c%252B%252B
    • http://files.johnwilland.com/uploads/1/3/0/7/130775850/jesukubot_jaleni_poverutokokevil_gusetadan.pdf
    • http://files.presidiocountysheriff.com/uploads/1/3/1/0/131070842/gavegaxopugefi-tokig.pdf
    • http://files.feedthewobbegong.com/uploads/1/3/0/9/130969708/9918213.pdf
    • http://files.tsaposmedia.com/uploads/1/3/0/8/130813799/volifuki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6364/7131/files/17769341061.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/85986298653.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/29806569033.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/panuwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/zupirufeba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/36187058145.pdf
    • https://cdn.shopify.com/s/files/1/0436/7102/7865/files/24908119840.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5353/files/33958585508.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_off00007e7b.bin
854f72ff0103ca8282c267bc8fed777465892642a3673113de9bddc923a9632c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7B 5216 bytes
font_01_sfnt_off0000905d.bin
229645d71e8adee90a4f8d3e4a12e624bcfc8cb761279c51454233ce7681a516
pdf-font-stream PDF embedded font (sfnt) at offset 0x905D 10192 bytes