Malicious PDF — malware analysis report

Static analysis result for SHA-256 659a2ff52651caaa…

MALICIOUS

PDF

45.1 KB Created: 2020-09-06 02:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fa31a78afc9f1152b4b8bb1ce5cbb33 SHA-1: 29a9a28e81d442a7674bc5380d1181daec676e22 SHA-256: 659a2ff52651caaac0d16e7771e0a480634c0ca45eacc46d172677e831719858
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=network+routing+protocols+pdf'. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded link likely serves as a lure to a malicious site, potentially for phishing or malware distribution.

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.me/wix?keyword=network+routing+protocols+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ceb2e8_b4b5098b7b7e4c659c18d57e871d5a1e.pdf
    • https://static.usrfiles.com/ugd/837d34_5ccedf20420a4e7c84b18c4090e7a137.pdf
    • https://static.usrfiles.com/ugd/576447_0ac86e1b588d4dd4b35297a2f3e57013.pdf
    • https://static.usrfiles.com/ugd/dd6616_18601f37c9424ab5bdc1553e69de5639.pdf
    • https://static.usrfiles.com/ugd/41f880_87722d4e43854cb98e4a20177b3b8fe2.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/stay_rihanna_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/classic_vanilla_mage_aoe_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/opera_internet_browser_free_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/wedding_program_wording.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/ancient_egypt_webquest.pdf
    • https://static.usrfiles.com/ugd/b8c837_288c2e9930604770a27787e45e837368.pdf
    • https://static.usrfiles.com/ugd/31593d_4b79687b6ff04012a1ac697fe23cadc0.pdf
    • https://static.usrfiles.com/ugd/48d9a1_d85213e8cea04b6da0a3fce61c44d810.pdf
    • https://static.usrfiles.com/ugd/5a4c69_ab66eec5b81c449bbeb591e20b1508d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b95716b858614aa88eb1b35794524522.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/70304459054.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/susinerexapax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8956/6627/files/english_grammar_book_for_class_5_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/vepijirabi.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_off000065a8.bin
d43991716d267007d1f93a4e71c3e00fe7ceaae0d4746201c4123783879da7fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A8 5120 bytes
font_01_sfnt_off00007745.bin
f972a1d625973ea1272eefe817099e08ffd4de832b639dfd3747f0f36e898f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7745 9980 bytes
font_02_sfnt_off0000997b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x997B 4324 bytes

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