Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9d179509e6feb7…

MALICIOUS

PDF

55.7 KB Created: 2020-08-20 06:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd493b562f45d20409c25ca59396c204 SHA-1: 221bf2b420f32681f0a04ca0f51bc12c7e42d0de SHA-256: 4b9d179509e6feb7104eaf57b5251996dabebda68e7ab53425e76a51648545b9
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=eos+70d+manual', which is likely used to redirect users to a malicious site. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning attempt to lure victims.

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.ru/pify?keyword=eos+70d+manual
    • http://files.bostonbulldogsrunning.com/uploads/1/3/2/6/132681767/pajadopoganegad-rukamitajewu.pdf
    • http://files.nuancetravelacademy.com/uploads/1/3/1/8/131856232/vezilidozakatuw-kanajux-nafimevinezafuz-nufagurabavik.pdf
    • http://files.themydlarzlab.com/uploads/1/3/2/6/132695492/975c8.pdf
    • http://files.shirlarae.com/uploads/1/3/0/7/130738562/lonemolufolevadeki.pdf
    • https://cdn.shopify.com/s/files/1/0436/7394/4217/files/autocad_drawing_to_converter_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/86621367571.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/46582366806.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/43375593616.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/81498535821.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/dollar_to_cents.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/2698582466.pdf
    • https://cdn.shopify.com/s/files/1/0446/8817/9353/files/building_design_and_drawing_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7473/files/67901764608.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/zodotezizovidizodogebu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/learning_styles_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/5449/6935/files/4646370216.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c12.bin
e80d520d51a45e604ee4712b4ba2f69b462129c2e198caf3333e63838e6ea514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C12 5052 bytes
font_01_sfnt_off0000ad35.bin
17840700046bf637227a8aec593fd6e28a281620b3e9ba053644dbd660420135		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD35 11080 bytes

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