Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6b9b7c6ff58364…

MALICIOUS

PDF

38.7 KB Created: 2020-08-17 09:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404a9c9383c106428c7f33c8f928026c SHA-1: 15f9a5d2a2ca37f72b370a55eb81d6e0d22c8306 SHA-256: 6b6b9b7c6ff58364b86af80e9871b06324162b6f0d716b31cc097a0a81a4518f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting an attempt to lead users to malicious content. The document body, though obfuscated, contains text related to "conduct disorder treatment pdf" and the malicious URL, indicating a lure. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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=conduct+disorder+treatment+pdf
    • http://kuxos.marvinsflyingdisccollection.com/uploads/1/3/1/4/131454065/6797760.pdf
    • http://livotobe.theyogaden.ca/uploads/1/3/0/8/130814161/3207732.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0449/2950/files/gukuwigudamibebiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/2741/2645/files/absceso_periapical_y_periodontal.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/xosopomefimawipepabuwixa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5459/4213/files/71826503924.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/tozenudad.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/applied_maths_3_kumbhojkar.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3336/files/91850306058.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/vovoweruwizefopoderakuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5854/files/foxariwukuma.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/alfredo_soares_bora_vender.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_off00005c1d.bin
a5dafa696a968ddeab2be004be0197f02f5c1c45721c246ffd81cde0aca17708
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1D 5172 bytes
font_01_sfnt_off00006d99.bin
5c6e15ca055d8d8c867093dc2fad8ab1001f3a5b944f6075151d02d37ed898af
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D99 9588 bytes