Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29d28c781508dd6…

MALICIOUS

PDF

38.2 KB Created: 2020-08-21 23:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23a1cf3f7ba90e3fcee57c2551043b1 SHA-1: aab1bc0e5a441e66b2985b69c35735998c187f5f SHA-256: a29d28c781508dd6ff66eddc3f88d6caa5591ebbaeae3ef47d1f74f22110166e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to distribute further malware or lead to phishing pages. The document also hosts a large number of links to other PDFs on Shopify domains, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier strongly indicated 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=drawing+angles+using+a+protractor+worksheet
    • http://files.timelessskincarelaserclinic.com/uploads/1/3/1/4/131438460/ece84e1bb348ff.pdf
    • http://gebodunal.haleylevy.com/uploads/1/3/1/3/131383483/ae3494986.pdf
    • http://napaluje.sieglindemcgee.com/uploads/1/3/1/4/131407836/teteworazebinu.pdf
    • http://files.clareandkatie.com/uploads/1/3/2/7/132710779/4982749.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/ganisar.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/gomamaduvufaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/college_ranking_us_news_and_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bagubiginapir.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/71049665817.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4602/files/terotelenasevisovukujuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/biblia_de_estudio_thompson_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5025/files/atul_prakashan_books_diploma_electrical.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b6b.bin
139833018687b3be246813cd0899cc1ac1102e1c32bd38ea075697a0fb3488dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B6B 5232 bytes
font_01_sfnt_off00005d42.bin
c6e68bfbb6d1fb8412dbf50950cf61275c915fff82103332b25bada0c84337fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D42 9580 bytes
font_02_sfnt_off00007e0d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 4324 bytes