Malicious PDF — malware analysis report

Static analysis result for SHA-256 38666ca88c2d9e6d…

MALICIOUS

PDF

48.3 KB Created: 2020-08-30 03:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15481df03fd2a8ccf8ea37b48db008c SHA-1: 2940375d27e3ceaa89ae0debd0a72a8b49680615 SHA-256: 38666ca88c2d9e6d4daad01494bfd79280b197d83d95c3c3e34b78bc4ee3ab51
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'farewell party invitation email temp'. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve search engine ranking for malicious lures or to distribute further payloads.

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=farewell+party+invitation+email+temp
    • https://static.usrfiles.com/ugd/b8c837_91bd76de3e76456eaec83261e4df3258.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5822b34ef1345ed99d76deda65a4480.pdf
    • https://static.usrfiles.com/ugd/2813e2_ef99d5d6b9184c3ea443989506420d20.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_830680ffb42b4b10a08eef2bd4cbe5fb.pdf
    • https://static.usrfiles.com/ugd/3be3a7_dec66fb459744ef4b02a339a7f7d9dda.pdf
    • https://static.usrfiles.com/ugd/d94ae5_1945dab83a33451993b304cb13b240cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bf3aa1a346e405286e7181b0cad3c62.pdf
    • https://static.usrfiles.com/ugd/b8c837_a88509c058504f01b420aa9940b59a71.pdf
    • https://static.usrfiles.com/ugd/43d598_3bd77ebf32c1466ebe0bf298532fb9a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_25286c4c53824c33bd323f6e63ff0e53.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/malagazexugedupetus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8801/8598/files/93436846798.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/pofazolorerupedunuba.pdf
    • https://cdn.shopify.com/s/files/1/0435/1308/6106/files/29923984205.pdf
    • https://cdn.shopify.com/s/files/1/0429/4583/9271/files/google_converter_to_word_online.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_off0000739f.bin
b7d701803231da49d82973ec179966122f92cde0386f55b82678d0308e788375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739F 4784 bytes
font_01_sfnt_off000083df.bin
96c7668a85d471e87ae3889ee8f6c8978f04300fbbf87f948cfd59ea8b8f7d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DF 10060 bytes
font_02_sfnt_off0000a654.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA654 4324 bytes

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