Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bddc5b3550837b8…

MALICIOUS

PDF

49.7 KB Created: 2020-08-30 01:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2348ddafa3fdaf53e047cf3f75fb135b SHA-1: ff97966e6a85b7d098b5afc34a0fedd37d9406d9 SHA-256: 7bddc5b3550837b8a6a9f5a1490934101892e5b937dddc3c4af9bb7c1cdb2eae
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many pointing to Shopify, suggests a potential SEO poisoning or link farm tactic to distribute the malicious redirector. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wix?keyword=chowking+lauriat+%25E0%25B8%25AA%25E0%25B8%25B9%25E0%25B8%2595%25E0%25B8%25A3
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/daffynition_decoder_algebra_with_pizzazz_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0463/5338/3581/files/guacamelee_skin_pack_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/forever_living_aloe_gel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.pdf
    • https://static.usrfiles.com/ugd/b8c837_20cc7e4667424dc59be3dfd229417251.pdf
    • https://static.usrfiles.com/ugd/b8c837_95420d694e0a40de886ba18e1d17b003.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6b15135841943f7adcf568fb7d4e042.pdf
    • https://static.usrfiles.com/ugd/a2d007_c1f897befd244cbdb1dab6ee73db223e.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2045/files/fatamejalibasuvako.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/bayesian_probability_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/51194308683.pdf
    • https://static.usrfiles.com/ugd/b8c837_e75fb7ffeecc407a85592424d02bffef.pdf
    • https://static.usrfiles.com/ugd/3aee12_2c9ff7b067b14864b9cc10946454f7ae.pdf
    • https://static.usrfiles.com/ugd/07625c_cdcf6579314840349264e164614501aa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004728.bin
3ca8785dcdd73f8c5f12fb201f10fdc3b703cbb083e99019e9fa3e0d77b1ad21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4728 4832 bytes
font_01_sfnt_off00005797.bin
d3ac8be9c5ab84e1837ccba55ec41e54e10f6aab8cb3208a6e84241790a288a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5797 6604 bytes
font_02_sfnt_off000068d5.bin
3e1922c96494e667c0b4740bfd946b8c10b498e2106f7f320c16f045d7771520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D5 7728 bytes
font_03_sfnt_off00007e3b.bin
9718527194ab1777189b9bf6a3d05bc3bce436bad18eb54c5f76ebff65ed0302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3B 9912 bytes
font_04_sfnt_off0000a06e.bin
7ab81ce3d92a9ec80982bbbf7df4378fdf9290867a146be245f32411f9d17586		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA06E 16616 bytes

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