Malicious PDF — malware analysis report

Static analysis result for SHA-256 33412f466ebf2d5b…

MALICIOUS

PDF

38.9 KB Created: 2020-08-06 04:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a21cf5588a0aa41fbaa9f1a751e59a5 SHA-1: a7e509b415d03eb86b58857f3b5329525118368f SHA-256: 33412f466ebf2d5b0e25f67f1d99fcdf7b4349eaeaf583f045812f7e005c3a1a
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.ru/pify?keyword=brahm+kavach+path+pdf+download, which is likely used to redirect users to a malicious site. The document body contains obfuscated text and URLs, further supporting the malicious intent.

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=brahm+kavach+path+pdf+download
    • http://files.wolfmatters.org/uploads/1/3/0/7/130775840/dilumafosa-dovaladel-nagisa-posaveton.pdf
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdf
    • http://mokewow.nauigreendiver.org/uploads/1/3/0/7/130739024/momugolasarabi_wexumifuvijesuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/turkish_march_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43127542751.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/bizhub_c227_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/romanticism_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0434/0262/5178/files/57568181947.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/61546374183.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/zaditelonibumo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/wooden_jewelry_box_plans.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/52374047469.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/darodawivid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/kajujubikawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/92464963026.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/1004/files/29411352524.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_off00004b6f.bin
8bddda30f21685c6ac4b414b75c852136ce7c7655bb29a2165a1c32a5e2eceed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B6F 5484 bytes
font_01_sfnt_off00005e02.bin
c2346f15feea2c3af2f20a1b9f353bcec0b168cf88b1496c24b4f5460f96a1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 14848 bytes

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