Malicious PDF — malware analysis report

Static analysis result for SHA-256 a656cda884e7744a…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 23:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 808871307117a1780875e003c0213716 SHA-1: dda93f136fd9e3f665ac3d88ec9f50d788cab6fb SHA-256: a656cda884e7744a7d0eb649d469b2c3e63b1f896c9a6bd4ca6c71021e6ac997
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector at `ttraff.ru`. This suggests the document is part of a link farm designed to obscure the true malicious destination. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing its role as a lure. The primary attack pattern is likely social engineering to drive traffic to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=barron+s+toeic+7th+edition+pdf+vk
    • http://files.theblessedfruit.com/uploads/1/3/1/8/131871871/kelapuduwun-kivudezup.pdf
    • http://files.fishermanswharfcampbellriver.com/uploads/1/3/1/8/131871621/milekuw.pdf
    • http://sezosav.altinominiaturas.com/uploads/1/3/1/4/131437657/jibaxineg_merukubotuge_lirimumilovu_dexefutavat.pdf
    • http://vavegov.keynoteuk.com/uploads/1/3/0/7/130776791/7883314.pdf
    • http://files.tinwagonboutique.com/uploads/1/3/1/8/131871433/2745504.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32823332632.pdf
    • https://cdn.shopify.com/s/files/1/0431/0060/2525/files/40848733545.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/60804247542.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/74074990769.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/80755281354.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/oxford_ib_chemistry_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/wovaretewaminoje.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/jogepoxikikanomosofum.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/54836559251.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/jolojaxasibadopexevutise.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/functions_of_administrative_law.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_off00005d73.bin
7ae25d330a18eec3e599b7f25d40507f4cb9398c14d5f2040d1e5f5de0f8c116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D73 5464 bytes
font_01_sfnt_off00007011.bin
f69a36cdc816c05c06eabad64f23231c6cce214f7be93a9c53bee13c9d2e496d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7011 11432 bytes

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