Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe3f4676bce302d…

MALICIOUS

PDF

43.8 KB Created: 2020-07-31 12:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d004bf072dc54b5e13d0515ee726799a SHA-1: fa3544f7bb72663ef06366307aea14976a31fd77 SHA-256: afe3f4676bce302dd3c30e4c1292f21b34579ad4436b3fd087169cf280d785e8
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, many hosted on Shopify. The primary malicious URL identified is ttraff.ru, which is likely used for redirection.

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.ru/pify?keyword=araby+full+text+pdf
    • http://files.sabasphotography.com/uploads/1/3/0/8/130873794/xuritudu.pdf
    • http://files.nypacwashingtonville.com/uploads/1/3/0/7/130740242/d6ba450e1a0d5.pdf
    • http://files.avskottakkalaustralia.com/uploads/1/3/2/3/132303012/mowisosiwimapijafixa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/susodavodene.pdf
    • https://cdn.shopify.com/s/files/1/0428/5916/7900/files/27957812692.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/30016889351.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/verenepaduse.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/23988751432.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/64975476140.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/65688197342.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/46753597627.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/1268325923.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/295303349.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/19513760111.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_off0000704e.bin
f92eb26ec8a997f8bb856012270eb16f95a4258454ec6e34d24c08c064a23b6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x704E 4772 bytes
font_01_sfnt_off0000809d.bin
69948752d510c1e3ca76a3f555e1039677a8c20d644011b5c4bf74949e1e6cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x809D 9892 bytes