Malicious PDF — malware analysis report

Static analysis result for SHA-256 5911f422e4311b3a…

MALICIOUS

PDF

41.8 KB Created: 2020-08-08 15:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4cef4698829fbc1194efd62b2a271f SHA-1: 3333bf88462ffae6de61c93fa9f1d66ca0219774 SHA-256: 5911f422e4311b3a02c1ee1073bb046d88be8cb076d7242a5b2ab7689c8e20ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, particularly 'https://ttraff.cc/pify?keyword=genetic+polymorphism+pdf', suggest an attempt to lure users to malicious sites. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, reinforcing the attack pattern.

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=genetic+polymorphism+pdf
    • http://zokeja.titopools.com/uploads/1/3/2/3/132302782/f91d848fc16ee.pdf
    • http://files.momentlu.com/uploads/1/3/0/7/130775817/cf483.pdf
    • http://files.nectr.ca/uploads/1/3/0/9/130969545/db16a412.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0058/files/fafunoluwejagikofopukoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4602/files/nokulane.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/best_mage_leveling_spec_1-_110.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/13628527552.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/breathing_underwater_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/65196567541.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/86725435648.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/7739806131.pdf
    • https://cdn.shopify.com/s/files/1/0438/5583/9382/files/ragukijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34515707504.pdf
    • https://cdn.shopify.com/s/files/1/0452/4238/4545/files/aarti_sangrah_in_marathi.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_off00006508.bin
43ed0f58ae60fb2da11607ee1f4bb9d8d4f5cfc67ce341728f2763a059d21780
pdf-font-stream PDF embedded font (sfnt) at offset 0x6508 5320 bytes
font_01_sfnt_off00007705.bin
6d7a7c75772832ca8be9feb0afc865d936f223396b126984f420c10b5bd731a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7705 10456 bytes