Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cfe8fbc2040edf…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 08:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ac3c0799fb9e8b83192515e69995878 SHA-1: f232677edba41854d86e5ba2ba45bf111ae57e8a SHA-256: 79cfe8fbc2040edf8c435ed6126058263d017c2b208d313823f9fb0687840b07
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=budding+in+bacteria+pdf', which is flagged as malicious. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to harmful content.

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=budding+in+bacteria+pdf
    • http://files.sunningdalehomedesign.com/uploads/1/3/2/8/132814958/841751.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://files.lkoc.org/uploads/1/3/1/3/131383497/bofepowoj.pdf
    • http://files.gogginslonestarfarms.com/uploads/1/3/0/8/130814601/xiderudokomo.pdf
    • http://files.murrayparkcondos.com/uploads/1/3/0/8/130874086/4651591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0205/2257/files/65911699625.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/30010080551.pdf
    • https://cdn.shopify.com/s/files/1/0435/4326/5434/files/96216980803.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/critical_theory_sociology.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/8032323694.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/nutrition_care_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/25684162813.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/tosusikiradosogedevamudoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/6208298817.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/825163748.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_off00006b8f.bin
b408a55b362b7633d4cc5b8f89f9e31c3aab70fcbf8d7997a464361238ff05ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8F 5304 bytes
font_01_sfnt_off00007dad.bin
4456ea61a5e7e3edc05eb798fd86156f2edb62d6836db13cf3997574fbd3f1c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAD 10280 bytes