Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be544048d90a177…

MALICIOUS

PDF

37.4 KB Created: 2020-08-29 16:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a02a418a9ada3a356f7bd6fc59e41a46 SHA-1: ba565443fbc8e2d61eb811c868ff884bd2ff40e6 SHA-256: 5be544048d90a177adee72fa0e4cd8ffe5fed3470c3360bf55d5e1a09f3cd35c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=intermediate+accounting+1+book, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to accounting textbooks. The presence of multiple links and the ML classifier's high confidence suggest a malicious intent, likely to redirect the user to a phishing or malware distribution site.

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=intermediate+accounting+1+book
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_06c60d10695c4a1c94a602ac0d4463c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5fec7998f894ceabaf8546830461235.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5a9a028e0b644cd8d98e93a5652333a.pdf
    • https://static.usrfiles.com/ugd/b8c837_db5137a3c7904d6e862e689d545f7115.pdf
    • https://static.usrfiles.com/ugd/b8c837_beca9e4ba94f44a2b7e5625795313e4e.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/vejizalalujebedibimul.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cbc25db2b5240a4bd649ba7f689209d.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_ffab4937db4b45ccafaefdef6f48a844.pdf
    • https://static.usrfiles.com/ugd/26938b_2c545b97891e426f9b456fcdfcc078e3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14490041284.pdf
    • https://cdn.shopify.com/s/files/1/0436/8501/9801/files/difference_between_gate_valve_and_butterfly_valve.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/dell_r710_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/7131/3822/files/advantages_of_learning_objectives.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/dowland_mp3_indir.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047e6.bin
8dde3f52b4cbc880cc5983908532161927543f6b3a24fbcde75fc13b7bdf608c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47E6 5124 bytes
font_01_sfnt_off00005931.bin
70b042576b82863a0098fd876cc9c6bdf6c784e6403adac312064c2011362d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5931 9960 bytes
font_02_sfnt_off00007afa.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFA 4324 bytes

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