Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a320892b6f405f…

MALICIOUS

PDF

38.2 KB Created: 2020-08-06 15:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e407892fac009173d30f26a1714e19ea SHA-1: 5db6a944a515d0a1f7fd2521c5620fc72409c6c8 SHA-256: b5a320892b6f405ff80a6bbaba384172dd7dadec1d2822fbbddaaf3a24b8c8d9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains hosting other PDFs, likely to improve search engine ranking for malicious lures. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=fundamentos+de+administracion+de+empresas+oscar+gutierrez+pdf+gratis
    • http://files.paisanoperformance.com/uploads/1/3/0/8/130874067/139211.pdf
    • http://nebit.plaid2pumps.com/uploads/1/3/1/6/131607600/vufoxow.pdf
    • http://files.texasstaycations.com/uploads/1/3/1/3/131384374/zukajebasilawuwenu.pdf
    • http://files.deltaworkready.com/uploads/1/3/1/3/131384589/xedetodugusuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/sujenejin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/13330243177.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/writing_sample_for_phd_application.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/craigslist_org_charleston_sc.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/47766854013.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/ca_real_id_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/21062934378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/56329164913.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/article_370_in_gujarati_language.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/51816550677.pdf
    • https://cdn.shopify.com/s/files/1/0437/3885/7623/files/highest_paying_job_in_sims_4.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_off000053ad.bin
5f03fa54803a56d9ca388f1462417bf4092bd9a9d382b7357b39e6bbae1116b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x53AD 5448 bytes
font_01_sfnt_off0000662c.bin
e66e925066bbe43859740a84b4e6eb0de66ca6cae0b8b95db65640b415f4134c
pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 10620 bytes