Malicious PDF — malware analysis report

Static analysis result for SHA-256 8501db58c83d1351…

MALICIOUS

PDF

41.9 KB Created: 2020-08-20 19:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcd81e1d5ab58288146f3856fd0552ce SHA-1: b8aeac881458d56df0d5b5552d90c6e9317a372b SHA-256: 8501db58c83d1351a1567dd2f6a8755e03624d7854d1caa70293d094b1ba0857
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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=cahier+de+vacances+gs+pdf
    • http://files.dehoniansocialjustice.com/uploads/1/3/1/6/131637546/3771201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93236297381.pdf
    • https://cdn.shopify.com/s/files/1/0437/8961/5266/files/jutulodusune.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/at_the_ivy_gate_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/guvoluwetupipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/wupopuraniwijazefena.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/watulizewepanukigoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/cash_flow_statement_questions_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0448/8128/1191/files/10th_class_maths_solution_tiwari.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/sapeduxonezikibakatijepap.pdf
    • https://cdn.shopify.com/s/files/1/0449/6012/0991/files/vmware_ballooning_performance_impact.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/26706221444.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055dc.bin
5f357b577028be7798b5c5ef60989dcf3b28455e0890d47a1c10efaf96c83946
pdf-font-stream PDF embedded font (sfnt) at offset 0x55DC 5068 bytes
font_01_sfnt_off00006713.bin
4520192ec10ed0f035b6f625a9184a10a5bbeae191f0dd43328012fbdd4bcfaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6713 11244 bytes
font_02_sfnt_off00008b55.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B55 4324 bytes