Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4389190042936b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 20:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de26b2c8d3857ebff27b8a6b43fbcc4 SHA-1: 0ed07a2834e49434e543495c35abcdf4c0d5cec0 SHA-256: cf4389190042936b6f783ab9235332b8228840da3af6feeb3a2a1121d56afd48
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains text related to 'Borderlands 3 season pass' and a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier strongly indicated maliciousness.

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=borderlands+3+season+pass+not+ing+ps4
    • http://files.sharondelesyabut.com/uploads/1/3/2/6/132680974/7492963.pdf
    • http://genibosa.flixhairandmakeup.co.uk/uploads/1/3/1/4/131453041/bitam-volixinilir-pivijim-lazorolamela.pdf
    • http://perotok.boundarybassclub.com/uploads/1/3/1/8/131857818/liwewimulaj-fexed-gawajaz-melejotiva.pdf
    • http://files.whereisthebrightline.com/uploads/1/3/0/9/130969775/1840326.pdf
    • http://files.duke-consult.com/uploads/1/3/1/8/131872273/kavaxofajag.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/54711751068.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/89144967383.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/68294886689.pdf
    • https://cdn.shopify.com/s/files/1/0432/1738/7682/files/surah_al_mulk_arabic_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/dixotapawaxomideli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7842/6534/files/operating_systems_concepts_9th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/advt_12_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/kawewerege.pdf
    • https://cdn.shopify.com/s/files/1/0440/5064/5157/files/23924339192.pdf
    • https://cdn.shopify.com/s/files/1/0441/0313/9480/files/expressed_implied_or_inherent_power_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000583a.bin
aca4661dc864e83ced881588becda2b59e91d4d41e92a3d0fb015380bbb54804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583A 5216 bytes
font_01_sfnt_off00006a02.bin
4723ffd72cc739a0cab7611ab0ffe1d047a6c97720af513647fe9859360d73ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A02 9988 bytes
font_02_sfnt_off00008c44.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C44 4324 bytes

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