Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6373e9c85e8fac4…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 00:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df28d7f9152268133e4da124e7662e70 SHA-1: 0bc6aafd542e6e076e6c39b4d110e5a8c1367e43 SHA-256: f6373e9c85e8fac40f3a576ccec8fcd47bfcba437adcacfc97a956ce427872b7
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=kenshi+faction+map', which is the primary indicator of malicious intent. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is likely part of a link farm to obscure the final malicious destination.

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=kenshi+faction+map
    • https://static.usrfiles.com/ugd/b8bbd7_f7105f1414c44b938455bb41c135c33a.pdf
    • https://static.usrfiles.com/ugd/5b9a87_660955bd66234369884c3047a1d7efe9.pdf
    • https://static.usrfiles.com/ugd/b8c837_237d3ab74ea845c88c79e92779e2444f.pdf
    • https://static.usrfiles.com/ugd/ed64d2_0f437471f7844612ba99039091780a50.pdf
    • https://static.usrfiles.com/ugd/b8c837_48cfaac47be848249bfdefd8e3902bd6.pdf
    • https://static.usrfiles.com/ugd/7f929b_b42f546c38cd4634bf1c7e9fb5a6fdc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cd9aa6b21b14e98aed75f44e3f86962.pdf
    • https://static.usrfiles.com/ugd/a43ec6_d582936145cd4b61a461c7edb32d5a00.pdf
    • https://static.usrfiles.com/ugd/d63aaf_da3c1fa31c194851b5400069149eda8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f998caf58f444d5c9ba04198824a294b.pdf
    • https://static.usrfiles.com/ugd/b8c837_2feb2f00adbc4d52b2ca40b7817f0849.pdf
    • https://static.usrfiles.com/ugd/c1de29_b99e527b4845474187af2e373ab9e8f0.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/tutuapp_apk_ios_free_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/joraw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/hatchimals_colleggtibles_season_4_gu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/41723703066.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/jamunox.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006809.bin
ea0bef7085ce89d9b3ec425d16a0183912b1f786a03228a8c6cc0d635c3865a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6809 5096 bytes
font_01_sfnt_off0000793e.bin
89b7dea037688c6d474b6b6bb6a1ce99a9b7e676301445364be5d6406c984a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 9896 bytes

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