Malicious PDF — malware analysis report

Static analysis result for SHA-256 a171609b33f275e6…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 04:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9d04a6824fdac328ac853ed8dc0da6a SHA-1: 934f6820b2f2b59d0e25f7d0c14c1f718b74ca6c SHA-256: a171609b33f275e695eb68bbf4c2d758a26b5b72eba53f6c2ac5c6ba2a89826b
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 it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to static.usrfiles.com. The primary malicious URL identified is https://ttraff.cc/wix?keyword=zebra+tlp+2844+manual+calibration, which is likely used to lure victims into downloading further malicious content or engaging in phishing activities. No scripts were extracted from this sample.

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=zebra+tlp+2844+manual+calibration
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/52726792859.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/administracion_de_pequeas_empresas_anzola.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4204/files/24611009889.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7249/files/jinutotulizikisufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4345/files/1136235746.pdf
    • https://static.usrfiles.com/ugd/6a7407_b44324fc7bf046e08b9b9600b283f294.pdf
    • https://static.usrfiles.com/ugd/b8c837_a894cd18e3894dc983e88f1a3faf382e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c31558bff1c4664b5282cef82c857d9.pdf
    • https://static.usrfiles.com/ugd/6c032c_6fe25dc912ca4b13ae7c48625f60ddb7.pdf
    • https://static.usrfiles.com/ugd/a771bd_8c52fb9a79f74241aebed5c5da7e5d67.pdf
    • https://static.usrfiles.com/ugd/18f527_70442dcbd75e4f71930ab9bb6e9832d6.pdf
    • https://static.usrfiles.com/ugd/f63f29_cee11a5610d94f8d8b94aa42e9bd0638.pdf
    • https://static.usrfiles.com/ugd/384ea4_f9377a3f3bd64e73a63f7a8f9a6c8cbe.pdf
    • https://static.usrfiles.com/ugd/599f1c_bd27c24eb612401f87883ff03165507c.pdf
    • https://static.usrfiles.com/ugd/83b1b3_6e3effeeacbc4084993abfb870fcb378.pdf
    • https://static.usrfiles.com/ugd/1f5cef_a1438c41aaa34410887dbed592004464.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_off00005c35.bin
653653b14362f5528c040892baa594a9968eebb0b9370a60261abec9266a4670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C35 5412 bytes
font_01_sfnt_off00006e83.bin
0eeb7654fc2454ffe6c232a5f77e9fe02574d7490eaa5cf43192a795cb447706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E83 9988 bytes

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