Malicious PDF — malware analysis report

Static analysis result for SHA-256 4884a5a09b8308ae…

MALICIOUS

PDF

41.2 KB Created: 2020-08-22 22:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee7d017d3496366cf269abe8f185b130 SHA-1: 9f4edcaff8ea56bd48abeae074a65bb91a8520ec SHA-256: 4884a5a09b8308ae20abe53850e1e08203c40c45ebc61f250fd9ab26dbd72f85
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector and a link farm. The primary malicious URL identified is ttraff.ru, which redirects to a search query related to a college uniform shop. Many other links point to PDFs hosted on Shopify, suggesting an attempt to create a large number of SEO-optimized links. The ML classifier also strongly indicated maliciousness.

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=chesterton+community+college+uniform+shop
    • http://files.campmujigae.org/uploads/1/3/1/8/131871518/lutunasadelobu.pdf
    • https://www.totalclothingshop
    • https://cdn.shopify.com/s/files/1/0440/7623/6950/files/nukeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/retowepafugukajarewofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7125/files/analytical_skills_for_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/nowejufikufivefevose.pdf
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/attarintiki_daredi_background_music_ringtones.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3024/files/44342095242.pdf
    • https://cdn.shopify.com/s/files/1/0452/2462/4288/files/23064768788.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/56532933375.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/stablemates_benny_golson.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/fatonoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0252/6887/files/transformers_the_last_knight_toys.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7579/files/39104592224.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/valutimatelelobakuvuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3102/files/81598477350.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/poxukivewuperijuwozu.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_off0000624c.bin
22243e75a4f2124d8a6c470ad2856bd507c3155deb9407230932069211d3e460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624C 5224 bytes
font_01_sfnt_off000073f9.bin
b6e0bdfcd2d27563d2658cf13ef5b22b57337912cf393e92632a11a45d2e4310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F9 10464 bytes

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