Malicious PDF — malware analysis report

Static analysis result for SHA-256 e415c0a2ddfd20e2…

MALICIOUS

PDF

36.8 KB Created: 2020-08-29 20:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3156d8681ebc5e5c2a59c738fe82c0dd SHA-1: ec1fbaa7f38fa2c02d3b37f317a9ff82eb5b4983 SHA-256: e415c0a2ddfd20e2d439f78aa16f6b140f927a1c19b170d76c0404df063b967a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a PDF redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to a book title and a URL that mirrors the malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector.

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=problem+solving+with+c+++10th+edition+reddit
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/govowipovovifikapaziwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8358/5949/files/suffixes_esl.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9013/files/gotatus.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/prayer_to_break_soul_ties.pdf
    • https://cdn.shopify.com/s/files/1/0434/4414/2245/files/68889882347.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/bella_ciao_hardwell_song.pdf
    • https://cdn.shopify.com/s/files/1/0457/9016/7206/files/nigerian_worship_songs_audio.pdf
    • https://cdn.shopify.com/s/files/1/0461/9026/4478/files/desoduxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2933/0077/files/zedexodiwubeb.pdf
    • https://static.usrfiles.com/ugd/a86d68_a54d6f6dd6a64385b661ef9e9c24466f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8107f5eafc494a6ca43e2a1100a99c7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d468cdc5ade940afacfa9fab9c164fc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3046/files/let_my_light_shine.pdf
    • https://cdn.shopify.com/s/files/1/0433/7480/5148/files/accounting_information_systems_12th_edition.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_off000045d8.bin
9bf8f052e1e3aa758f7776b90768a5acbbaa158e31df7c1eec9736befe0dfb7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45D8 5416 bytes
font_01_sfnt_off00005825.bin
61342887e7a5092bab788465d0a21299e008653b615491a81f76ee6c5434fd87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5825 9316 bytes
font_02_sfnt_off000077f7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F7 4324 bytes

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