Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f275bb6201e7779…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 02:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16bad92a3aa68881ffd4020bdab7dded SHA-1: b48041b66931db913ed31640c830d01fc4db1c1f SHA-256: 8f275bb6201e77798746a65ede45e221cb84036555167c4f7e1b6118e0026e88
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=adobe%20acrobat%20professional%20create%20fillable%20pdf'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/wb?keyword=adobe%20acrobat%20professional%20create%20fillable%20pdf
    • http://files.sunglasspanache.com/uploads/1/3/0/7/130775045/fd1debb750b5a25.pdf
    • http://lekiwex.gite-brittany.com/uploads/1/3/0/8/130814328/1056809.pdf
    • http://kofaxeri.starfenceandgate.com/uploads/1/3/1/6/131606739/f1c834246ec.pdf
    • http://files.utahmicroloanfund.org/uploads/1/3/0/7/130775310/gurexadudedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/65352698444.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/pune_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/35385206553.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/wobep.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/48376749958.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/86343379528.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/logukizavoxezebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/detalosanop.pdf
    • https://cdn.shopify.com/s/files/1/0435/0751/5558/files/tasivexusu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/bnficiaire_effectif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bepojarovizezeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/96244031566.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_off000069be.bin
168ccb2571d878d592f276bf65892558253d445831ca0da25f404d8a297882f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 5276 bytes
font_01_sfnt_off00007bba.bin
37059efb80009579970280fb1d8de372f499d958b192cb9a5d583a37969646c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBA 10120 bytes

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