Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f631755b498083…

MALICIOUS

PDF

51.0 KB Created: 2020-08-08 20:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e578acdbdbc3f563f95a2b15044bc427 SHA-1: d55080304e7ca391139896a21733cb00e7f6a7ef SHA-256: f3f631755b49808322d6f121633ab3e25559dbbeb5033cc9ca44268b4b68cfe0
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'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the lure.

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=air+pollution+causes+and+remedies+pdf
    • http://tifinaxu.thefishroomliberty.com/uploads/1/3/1/4/131453109/0e5918a4e209.pdf
    • http://dejib.mygentlebeginnings.com/uploads/1/3/1/3/131383314/tonokoko-debuvabalarude-favegonesis-lixevale.pdf
    • http://files.alumniunitbv.net/uploads/1/3/1/3/131379253/subuk_zigezamurejatad_gobefiwimot_vubemeluseni.pdf
    • http://files.icansewthat.com/uploads/1/3/1/8/131856163/3094089.pdf
    • http://files.matthewschlimm.com/uploads/1/3/1/4/131407080/380062.pdf
    • https://cdn.shopify.com/s/files/1/0431/8334/1728/files/9058130000.pdf
    • https://cdn.shopify.com/s/files/1/0430/8048/2967/files/59574537508.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/89192118955.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/mackie_dl32r_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/losiluvavasiraxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/medovudapiminexoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/96777153634.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/lekobewuwujafofoperepur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/kujefifalopazu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/sources_and_effects_of_air_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76222514852.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/27132033624.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/92135109049.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_off00008922.bin
e465d7b065c14ef7baac96dd279bd26f874c7f267b8a033e3a2318af654b10ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8922 5288 bytes
font_01_sfnt_off00009b09.bin
768ca5e9d2787c83590614a85ea02537c105ee3e997457795ca41368f786d2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B09 10364 bytes

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