Malicious PDF — malware analysis report

Static analysis result for SHA-256 8351fbcfd2a21f52…

MALICIOUS

PDF

53.1 KB Created: 2020-09-05 14:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e19bc263a4f5e96dfaee3654a5b25c47 SHA-1: 5578d19b423ddafa395043fc464c16f556fbf9f0 SHA-256: 8351fbcfd2a21f52c49f651051b7361188870e7b9b0d5a2e7cb75e8cecd30aaa
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.club. The document body, though heavily obfuscated, contains text related to 'Defect ageing report in jira' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=defect+ageing+report+in+jira
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43127542751.pdf
    • https://cdn.shopify.com/s/files/1/0438/9568/5288/files/project_acceptance_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8371/files/juzedezanuverezimukute.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6372/files/86890319944.pdf
    • https://static.usrfiles.com/ugd/99afdc_16d079f5053949d8b62a1a5852d02e31.pdf
    • https://static.usrfiles.com/ugd/9374a7_ec840df9b3af4d5ba680c423748ad3d8.pdf
    • https://static.usrfiles.com/ugd/c3f88d_cca7229aca244deeaaf40b979b8ed33e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8298f1fa6bdb441c93f0ece271c65248.pdf
    • https://static.usrfiles.com/ugd/05e3ad_156ca8ea83614e7c9f7457607186c83e.pdf
    • https://static.usrfiles.com/ugd/b48b60_6e3a80de051a498c9cbee6a61e8feb0c.pdf
    • https://static.usrfiles.com/ugd/08fe48_ab2ce457acf647e4b07c049b466fd577.pdf
    • https://static.usrfiles.com/ugd/58a813_61410604cf004a1c9c6de90b69e95def.pdf
    • https://static.usrfiles.com/ugd/55cc32_22a7c3f30dcc483d8987ccb7c2a13f00.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/28435402111.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/cheppave_chirugali_telugu_video_songs.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
stream_005_off0000ae6e.bin
101398386b5d1b492dcc6134022e973352624bbfd9936536862f4f4ea101e897		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAE6E 17132 bytes
font_00_sfnt_off000079d8.bin
4562da8ec68dc070eed6f8edca0909147a95b117dcf91c052e4dec127c074b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D8 5048 bytes
font_01_sfnt_off00008b2a.bin
ffeaac8e70e00e3e11ad438fe3588a62127db56659b8cc4047866a0792f7e6b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2A 10512 bytes

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