Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4001a10065255e2…

MALICIOUS

PDF

60.0 KB Created: 2020-08-19 21:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e347caadc97a13425a8ab71c510551d1 SHA-1: 14ec09d483da2906580b84ac8007cbc6c19c7760 SHA-256: c4001a10065255e20d9c65ee5435f8e085e9b3f91fc82249ecda924abe25893b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.ru/pify?keyword=cyberduck+portable+windows', which is also listed as a malicious redirector. The presence of numerous links suggests an attempt to direct users to external, potentially malicious, sites for phishing or malware delivery.

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=cyberduck+portable+windows
    • http://files.connectivityusa.net/uploads/1/3/1/6/131606454/8656316.pdf
    • http://files.abesboatrental.com/uploads/1/3/1/4/131453208/9cd1d20ad.pdf
    • http://files.bbsimon.com/uploads/1/3/2/6/132682570/tudijimavu.pdf
    • http://gurolupuk.theorwellscommunityshop.co.uk/uploads/1/3/1/4/131409090/nalezez-romemej-zerigapus.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8050/files/simplesmente_acontece_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/kevunodozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1797/7504/files/buparisoxizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0054/4931/files/84717375070.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6870/files/zovenuzudemujokuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagitigupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1866/files/98195255018.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/trusting_god_bible_study.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6911/files/dedakiniruraxolivasoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/putufuwi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/22578487468.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b37.bin
450ca30217685671769d50b1e776aa1308a04423d822b4899a640997cb731b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B37 5660 bytes
font_01_sfnt_off00007f05.bin
136b3f618a13ab73d0f385abf33edb3d596ef20802b9673bedc478ec2593af7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F05 5372 bytes
font_02_sfnt_off00009159.bin
2da83060ad210a9a1743b04a22b2cc5ebb14ba7af64fbaa5f25da2d26a1b3d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9159 6640 bytes
font_03_sfnt_off0000a2f7.bin
56c1e298fce09241d029717ad755941f1c63331071c4f0d9b5005dbf443f5a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F7 11264 bytes
font_04_sfnt_off0000c958.bin
ab52cd6058e2387e28f9e08a9bfb9d9562fc63bb839c0e172710fef602dfda09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 17028 bytes

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