Malicious PDF — malware analysis report

Static analysis result for SHA-256 088df3ea9e88d114…

MALICIOUS

PDF

65.7 KB Created: 2020-08-29 01:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec5ba377be9de94365820a315df9689 SHA-1: e2840aa7cb68f2f388462a41252a4a4d25a7e730 SHA-256: 088df3ea9e88d1147b205ea442f197a5eda867fa010ed9a76b296d6f43128109
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'brachistochrone problem pdf' and the malicious URL, suggesting a lure to a malicious site. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious content.

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.cc/wix?keyword=brachistochrone+problem+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_295d1b478cd3491e9d6f63357d716718.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbc1a33656694093b4b3582e9f56fbf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_73f68333ff6645ce9e90e81db893bbea.pdf
    • https://static.usrfiles.com/ugd/b8c837_7184c0ae76c04ed7bf1622da833e4e82.pdf
    • https://static.usrfiles.com/ugd/b8c837_6842c2b36a42404caf4783df198271e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcae2287c2444677980c1b0ab658b60f.pdf
    • https://static.usrfiles.com/ugd/b8c837_708fe6c2d1b544dd839c8f4c871f41a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d00b330d89e41bbb84a22664eb146c1.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/autocad_lt_2013_activation_code_generator.pdf
    • https://cdn.shopify.com/s/files/1/0436/9226/1529/files/personal_leadership_development_plan_template.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bb02df74e0c4388b2052b7cbe492e65.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf91498ea48742079480099e6ea22503.pdf
    • https://static.usrfiles.com/ugd/b8c837_8758fbd13a154e019d46c88081db4d8f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a2a2.bin
b5032bef8f71dc61bb7d29a759957f2a5b3406dcdf93848f167389c0e201c247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A2 5584 bytes
font_01_sfnt_off0000b55f.bin
0c04d01674457dfe0385620865d5fc436cc431ed9a50bb929dbdea0146844e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 14872 bytes
font_02_sfnt_off0000e4bc.bin
556b3288551856ca23c1e287a8d51f25028f98ccdff504d85f7438ac23e0523e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 16196 bytes

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