Malicious PDF — malware analysis report

Static analysis result for SHA-256 d575217409b530d2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 09:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f70e6465db0ac1c63a4f0e27de4a85 SHA-1: 2d6806e631c15fc9e1f9a85cd02bd2236bf8b027 SHA-256: d575217409b530d21dabd2a4ca4d72250366813cd82a49fc91b1e429f6770d2f
154 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.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are unknown or point to potentially suspicious domains. The ML classifier strongly supports the malicious verdict.

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=break+even+analysis+example+problems+pdf
    • http://temuve.centralsecurityservices.net/uploads/1/3/0/8/130874218/dobidedumit-nopovineweziw.pdf
    • http://files.nyacuchiro.com/uploads/1/3/2/6/132680874/d46b5.pdf
    • http://mamegafat.the-crazycucumber.com/uploads/1/3/1/3/131380429/konavufosaxuta_toxokanurasibas_bifejomu.pdf
    • http://files.nationalhellenicsociety.net/uploads/1/3/0/8/130814623/9913736.pdf
    • http://files.kantishnaouterwear.com/uploads/1/3/0/7/130776887/7229470.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/76843566366.pdf
    • https://cdn.shopify.com/s/files/1/0440/0440/9494/files/public_administration_books_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0439/1567/3752/files/sonic_says_meme.pdf
    • https://cdn.shopify.com/s/files/1/0431/6912/0413/files/craftsman_lt2000_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/lajudinujawip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/3405366866.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/12th_centum_scored_answer_papers_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/dutawiwunalisemabojujer.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8533/files/bradley_hand_font.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e4.bin
c475bab6e4545ddeccf2e810ea6c4d0bd8a9a8ba7ce76424e8a31640c27e8f18
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E4 5668 bytes
font_01_sfnt_off00007a30.bin
20038fd7c4b112b20493a93f770a4ec9589cc7fb70c76e09e76cc32c33151e07
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A30 10640 bytes