Malicious PDF — malware analysis report

Static analysis result for SHA-256 311c2c6924e079b6…

MALICIOUS

PDF

47.0 KB Created: 2020-08-05 17:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62ead893ea46f1d3390d622be656810 SHA-1: d3aecbe657efe2aff37d9586375df3f0a76e808a SHA-256: 311c2c6924e079b618e4da058dff8820d6d625f8afe3e9fffb142eb488e89042
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to interview questions and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure via a deceptive link.

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=200+top+electrical+engineering+interview+questions+and+answers+pdf
    • http://faziz.jimmyvibert.com/uploads/1/3/0/7/130775672/3782045.pdf
    • http://tixujetu.rosaliadivenezia.com/uploads/1/3/1/4/131407227/dijapulo-vamenisetixigep-wupekitej-sukuziv.pdf
    • http://files.startmyseo.com/uploads/1/3/1/3/131380889/5f457.pdf
    • http://files.thekerikgroup.com/uploads/1/3/0/7/130776519/fexigodujigixonag.pdf
    • https://cdn.shopify.com/s/files/1/0436/0847/3763/files/speak_english_like_an_american_amy_gillett.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/sizulibinobi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/dizagukuwanapimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/guxakofufujefifum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93880590480.pdf
    • https://cdn.shopify.com/s/files/1/0430/4492/9690/files/kalafubinoxifupavebira.pdf
    • https://cdn.shopify.com/s/files/1/0435/3985/7572/files/sedog.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/99946722331.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/vepazaduwak.pdf
    • https://cdn.shopify.com/s/files/1/0431/3474/6790/files/44527327621.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c6.bin
f1694f884ee347158a4cb6f32f8e6e2e82176b4bdc3a54f26574a00a13e5dabf
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C6 5780 bytes
font_01_sfnt_off00008b8f.bin
6943a9e44b39aea16acd3ce7a2460378cdaace177705c1541b200480adf7db25
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8F 10276 bytes