Malicious PDF — malware analysis report

Static analysis result for SHA-256 4526e36b4d10c1f1…

MALICIOUS

PDF

56.7 KB Created: 2020-08-28 22:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa1fc559716ccfd9a1817c9f57c64b1 SHA-1: d5a7d6c040440039cef162b3d2928cc8c8321494 SHA-256: 4526e36b4d10c1f10e4ae5d3b3cde060e1006eb710992177a255ae6cb2a65927
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and numerous other links to domains like 'static.usrfiles.com' and 'cdn.shopify.com', suggesting a link farm or SEO poisoning tactic to attract users searching for specific technical files. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to harmful 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=mt6572+android+scatter+emmc+txt+free+download
    • https://static.usrfiles.com/ugd/b8c837_d4331bf6850348ae97cdea7eee0664fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd304fa80b284c0da156ffa63fbaaa78.pdf
    • https://static.usrfiles.com/ugd/b8c837_8049b98673904312b7b2d5c28064677c.pdf
    • https://static.usrfiles.com/ugd/b8c837_07678323f78b4d569390d06684eff081.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/charcot_foot_deformity_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/cyclohexane_conformational_isomers.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/72861586898.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/croix_kabbalistique.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9a201ea9e9b486cbd7d8926f9c12019.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea766fa082de4f4b8f9cab86dc92a606.pdf
    • https://static.usrfiles.com/ugd/b8c837_02dd6ffa13a441a082f6696bee891411.pdf
    • https://static.usrfiles.com/ugd/b8c837_d38277e2a9b847398950cba23cbe59a6.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/35428756334.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3671/files/71214247331.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/napakovabasixerovulepowag.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_off0000b1c1.bin
aadbc54e24681f88d8a37f3676afba856e6f96989a529027c5e3294eb52f9597		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB1C1 20904 bytes
font_00_sfnt_off00006f1a.bin
8e770b8620d8863f7b5c8f93fef8c5a06fc98705afe79da0b2d3c1f997ef81c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1A 5824 bytes
font_01_sfnt_off000082fc.bin
ea30b6be0d1152eea890b2e87de4881f9cd069a90e4c4750a1648bab0f410888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FC 14868 bytes

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