Malicious PDF — malware analysis report

Static analysis result for SHA-256 968269341adf5125…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 19:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d53d28d5dba2cfc6b083da169097c688 SHA-1: 0701cff824cb46d0c30a7129471db4d16913b28d SHA-256: 968269341adf51254cfca53bccbe216c70cc4ec93002ff10a6ad5b0c66222193
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body and embedded links suggest a lure related to 'best fan service anime' which is likely a deceptive tactic to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains duplicate objects, which can sometimes be used to evade detection.

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/wix?keyword=best+fan+service+anime
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/35880168988.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/wuzedisotelabusobovu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/mysql_my_conf.pdf
    • https://cdn.shopify.com/s/files/1/0469/4537/0273/files/yellow_wallpaper_gilman.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/43369755022.pdf
    • https://static.usrfiles.com/ugd/b8c837_113ebf78a3324752a355d55de411a222.pdf
    • https://static.usrfiles.com/ugd/a771bd_56ddd09c222d461295ccb59d43468e27.pdf
    • https://static.usrfiles.com/ugd/234f58_b7f30e82f87747139fed18ff29f316bf.pdf
    • https://static.usrfiles.com/ugd/756799_631c61635ab744b5ae6cdfe05e480e21.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa3f1faec73e480c94bc9a41c8222df8.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_off000063c9.bin
dd275198ca14cc6477f8a4579c69f18e32234277ffb1f5cce67793edfe235bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 5104 bytes
font_01_sfnt_off00007516.bin
6eeecdb80edb88fad3804bfa350aaeebd8fe6bdaadf6ec6c58968df8dcc12192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7516 10460 bytes

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