Malicious PDF — malware analysis report

Static analysis result for SHA-256 5397e5faf5e12f02…

MALICIOUS

PDF

43.3 KB Created: 2020-09-01 00:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9b9f9884e7b6615cda192655b852374 SHA-1: ea67ad2671edbc88e8b25deecb34d3413490201f SHA-256: 5397e5faf5e12f0235d1e9929fb309f16d8e937d33f2ae350b54998b41604a76
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure to external content. The presence of numerous links to external PDFs, many hosted on static.usrfiles.com, indicates a potential link farm or SEO manipulation tactic.

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=reported+speech+exercises+with+answers+upper+intermediate
    • https://static.usrfiles.com/ugd/b8c837_658eb02af51e4b33abb5bdd290bff5be.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f31962ec1ad4c449e17e7687c582818.pdf
    • https://static.usrfiles.com/ugd/b13fd1_e1c0c641ebf646f4b42f4e20c633c3c5.pdf
    • https://static.usrfiles.com/ugd/362633_39ef0ce609974009b7e4513cbf0c8651.pdf
    • https://static.usrfiles.com/ugd/3649d2_962bd2fbb3c14d12af0723f2feb350c0.pdf
    • https://cdn.shopify.com/s/files/1/0462/7827/9317/files/doduzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3089/files/79621154810.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/13739408933.pdf
    • https://cdn.shopify.com/s/files/1/0454/7008/9382/files/mithun_chakraborty_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/3471605756.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6624/files/bilotomogevebizazibezal.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/mevuravima.pdf
    • https://cdn.shopify.com/s/files/1/0437/4986/7681/files/b._ed_syllabus_for_entrance_exam.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad64b139ef814e4697fa16b5cca6eaac.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_d4618246944a41e8972849366f91a92f.pdf
    • https://static.usrfiles.com/ugd/784815_293419641c11412a972f38875685c86a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3f3873bd5d94985827907ad64daa3e0.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_off000055a2.bin
47a8f7499f979295dcf83ff81f9a95d812b56c479d5947377555c2d272c7ed23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55A2 5448 bytes
font_01_sfnt_off0000681b.bin
310c37261677362a3ecfcbdfddfd71aabba717d469bd82f3a8d693bfff8453d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681B 9984 bytes
font_02_sfnt_off00008a88.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A88 16096 bytes

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