Malicious PDF — malware analysis report

Static analysis result for SHA-256 2816bb2d8480d559…

MALICIOUS

PDF

49.7 KB Created: 2020-08-21 06:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47dd0622d5456ea8dfd9899f78dc0e0 SHA-1: c212e880050a759efb2340af81274576219da79d SHA-256: 2816bb2d8480d559bc57a2164d1cb01b0bf4540e6f88c6ad70349681ab1ca36c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link to 'ttraff.ru', identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL and a reference to 'angry status in tamil', suggesting a lure. The PDF also hosts a large number of external links, many pointing to Shopify, likely as part of a link farm to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=angry+status+in+tamil
    • http://files.triamantgroup.com/uploads/1/3/1/4/131437775/1809724.pdf
    • https://cdn.shopify.com/s/files/1/0429/3761/4499/files/dotowepam.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/pulawumerozuxofezodirin.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/light_reflection_and_refraction_class_10_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7598/files/game_android_mod_apk_offline_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/vagipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7269/files/sri_rudram_chamakam.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/51749565090.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/22338010660.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/38647091474.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/216748991.pdf
    • https://cdn.shopify.com/s/files/1/0439/5093/2123/files/21463450075.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/83565207408.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/18034928855.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f7f.bin
c05effe27595f77f38bb602c71684c01c808fde45a1856f00f632c28b3fedd38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 5096 bytes
font_01_sfnt_off000070be.bin
c2bb34754f571dae6491d377c18dd60c2ec6e52b7aa34137642ae12e0e801cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BE 3280 bytes
font_02_sfnt_off00007daa.bin
cc18d78fce0477cb97bdea7be68db3606d4fa865deff61665935e729c594a845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAA 10300 bytes
font_03_sfnt_off0000a103.bin
05c75fb2ea3f2003f47bb55d39f8d555e801f36ea1c58802ce245b62fa0e6d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA103 16488 bytes

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