Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df907a0fa64e283…

MALICIOUS

PDF

39.1 KB Created: 2020-09-05 15:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 277d83732503d51afc40f667d0d6e414 SHA-1: fd9ff067ee5a033690cbc9e46ae7fa053f8bad17 SHA-256: 3df907a0fa64e283a6491f46ba11cf331c4f0f13bd7833f17e6c1322cb3bb00e
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=transformational+leadership+attributional+complexity'. Additionally, the PDF is flagged as a link farm, containing numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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=transformational+leadership+attributional+complexity
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/google_app_store_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/principles_of_banking_and_finance_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/html_form_action_redirect.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/hyperion_contract_873.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/69675988663.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1959/files/adding_decimals_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/dobowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/83380021394.pdf
    • https://cdn.shopify.com/s/files/1/0432/7482/9987/files/89912973612.pdf
    • https://static.usrfiles.com/ugd/d4c4cf_72dd83c7a9fb425dbd903ffc48dedcff.pdf
    • https://static.usrfiles.com/ugd/2d1648_dbcd23caa6c84f0fb6371e3adff33a0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d555d847c9024a99bd9a694c86e40bf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_73d44f7e83164624909aa3b40919c01f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c773afb0a1c040b3abcb07471c7f7c08.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_off00004c8c.bin
73be2b98e230d1e047baeeb1de99def057fcc8706a93d770214786c941e023d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8C 5536 bytes
font_01_sfnt_off00005f26.bin
74a15323f5e2acdb7e5ddceaea133eced1bdb031a83719b54c25eea49a4c31f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F26 10064 bytes
font_02_sfnt_off00008156.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x8156 4324 bytes