Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1a0632b631cef8…

MALICIOUS

PDF

45.0 KB Created: 2020-09-01 00:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fec41e64230332c75cff9f06aec0f02 SHA-1: 8314ccc17a35ebc637dc3d4b29ec9933a15e78d6 SHA-256: 4c1a0632b631cef85614ead06948bf79b9560af150937d03d84ef08e1df276a0
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains a critical heuristic firing for a malicious redirector link. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL, 'https://ttraff.com/wix?keyword=the+masked+singer+golden+lion+performance', is likely used to direct users to a malicious site. The document body contains garbled text but includes the malicious URL and several Shopify-hosted PDF 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/wix?keyword=the+masked+singer+golden+lion+performance
    • https://cdn.shopify.com/s/files/1/0436/5107/2153/files/bfs_and_dfs_program_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/9980/7126/files/82676451415.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/medicina_antroposofica_familiare.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/61457887498.pdf
    • https://cdn.shopify.com/s/files/1/0435/5365/2895/files/73934687322.pdf
    • https://static.usrfiles.com/ugd/b8c837_a36c8583f62e4a5581e4a3c14d6868a1.pdf
    • https://cdn.shopify.com/s/files/1/0434/4663/2615/files/canada_study_visa_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/journal_of_applied_spectroscopy.pdf
    • https://cdn.shopify.com/s/files/1/0433/7002/1014/files/xibutupopozonofire.pdf
    • https://static.usrfiles.com/ugd/accd1f_f38019e6b68a41bcb697088cd8ee40e2.pdf
    • https://static.usrfiles.com/ugd/078c79_0cb39f48137147b2899ef977b755f6cf.pdf
    • https://static.usrfiles.com/ugd/12dc78_defbbb687afc406f84d68a0e8cf92b69.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_b0a9e0ccd8be439d94433dafab5bb953.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_off000063f3.bin
0426484b1a0080baf11a23035633736401e92c93f115dcc729027e9c78baf194
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F3 5288 bytes
font_01_sfnt_off000075b7.bin
bde7ed6b1f976e7942a1d9841d11d7acafe95e989708d62114892ad62902de6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B7 10308 bytes
font_02_sfnt_off000098e9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x98E9 4324 bytes