Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a65f2b1f83f7aaa…

MALICIOUS

PDF

48.5 KB Created: 2020-08-07 20:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fed3bae601d7c2ff75ddfff41a1257b SHA-1: 9084c35fa3f82fd31cda72ffddc1607e9f69080f SHA-256: 7a65f2b1f83f7aaa39376a9aa846ca0359ebb5f1cb983b857ced3f55cf4453b6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on Shopify. The document body, though heavily corrupted, contains the malicious URL and several other URLs that appear to be part of a link farm. The primary intent appears to be luring users to 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.com/pify?keyword=active+voice+and+passive+voice+question+pdf
    • http://files.jjjohnsonauthor.com/uploads/1/3/1/4/131437268/lotoxaboxubuw.pdf
    • http://files.mylittlebiblestudy.com/uploads/1/3/0/8/130873899/womafobanuz_kovinijoxexaxu_meroxato_zefakekili.pdf
    • http://files.veteransmemorialhighway36.com/uploads/1/3/1/4/131407051/detilug.pdf
    • http://files.mindfuledibles.me/uploads/1/3/1/8/131856743/aa3a54.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/civil_engineering_book_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/54625412954.pdf
    • https://cdn.shopify.com/s/files/1/0436/1220/9315/files/how_to_turn_off_wifi_direct.pdf
    • https://cdn.shopify.com/s/files/1/0435/8085/0335/files/latiguraloja.pdf
    • https://cdn.shopify.com/s/files/1/0440/5637/9557/files/maulana_abul_kalam_azad_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/75876386730.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/nikulile.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/4455659317.pdf
    • https://cdn.shopify.com/s/files/1/0434/8048/1954/files/english_grammar_book_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3733/files/beluxuwijovupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/zuseni.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/27452108332.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_off00006b31.bin
7bdf3ff91bc392ab37ee43eb065cf7b610df0a69b7b3d26a89e7769dbbd783f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 5196 bytes
font_01_sfnt_off00007d02.bin
e9ca3ebb098bad73fd57018a0a8246b0e473d412e49e964b359d79b6d8378517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D02 10120 bytes
font_02_sfnt_off00009fcb.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCB 16092 bytes

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