Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b15d36162386f1…

MALICIOUS

PDF

36.1 KB Created: 2020-08-28 22:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e0876d04ef5e1aba45e6ccf10272f2 SHA-1: 39b60132ff88cf8b8993a090a130f37ae8cfebfd SHA-256: 56b15d36162386f1a231c9afad354fb1c6d382668a6e0c860ccf17a162e2ba87
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, a common tactic for SEO link farms and phishing lures. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the ultimate destination for users clicking the links. The presence of a large number of Shopify-hosted links suggests an attempt to obscure the malicious destination and potentially leverage the reputation of the hosting platform. No scripts were extracted, and the document body is heavily obfuscated, but the link farm and redirector are strong indicators of malicious intent.

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/wix?keyword=dil+chahta+hai+t%25C3%25BCrk%25C3%25A7e+dublaj
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/23496734174.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4162/files/argumentao_e_lgica_formal_resumos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/49607523977.pdf
    • https://static.usrfiles.com/ugd/b8c837_0855aecdad9f4b0aa0a1147d93c609aa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/physiology_of_heart_rate.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/titilizinijigovo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1674/7170/files/morning_pork_cutout.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/abrsm_grade_5_theory_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0437/2486/5685/files/convert_mixed_numbers_into_improper_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4527/files/ncert_maths_book_class_5_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0464/8727/3624/files/elm327_bluetooth_driver_windows_7.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_off00004d12.bin
95562ddfa5fe70bcb895fba2d82ef0db0764a9ac5087cab9c44a9b0ec1ca20a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D12 5428 bytes
font_01_sfnt_off00005f05.bin
01c576dfefe5512a31b0f50b39955183373b8db249a76ba208a6419aef9bdfeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F05 10852 bytes