Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d664df7b396efc7…

MALICIOUS

PDF

36.9 KB Created: 2020-08-17 15:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d19341ace3f9f33bd582557c1a9a4e4f SHA-1: d3129e947f7e8ee7570285611f7e037f4b2084b1 SHA-256: 9d664df7b396efc7b461318669c1e6001d4cb24093647dcfd708705590279efe
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.ru, disguised as a tax calculation software download. This indicates a phishing or malware delivery attempt. The document also hosts a large number of other PDF files on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious links. No scripts were extracted, but the primary malicious activity is the redirection to the harmful URL.

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=software+calcolo+codice+fiscale+gratis
    • http://files.hirzelinteriors.com/uploads/1/3/2/6/132681783/junugikozetave_wudulatabemeba_teparolos_gevijobugudut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/81012706563.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/minecraft_pig_simulator.pdf
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/anemia_minsal.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7388/files/fotupe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/critical_thinking_worksheets_for_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0434/6629/3401/files/80018914877.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/26668250518.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/pathophysiology_of_perinatal_asphyxia.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/27497703153.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_off0000508b.bin
720cb9e486c01ccb871b1a965c231ea8f8c5b9c60ee841af57f2a56b3c320f24
pdf-font-stream PDF embedded font (sfnt) at offset 0x508B 5384 bytes
font_01_sfnt_off000062ed.bin
5e0266c5fc33c751866729483424e48305d1cb1fff0a5a34e39179aedbdc5cf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 10580 bytes