Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a9254ac91888b9…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 17:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe7a7f2f19fbe70135cddd7c4d381ecc SHA-1: 03d3538ffb39cc54015733bb759d464b29e31183 SHA-256: 87a9254ac91888b9a86000edcb37437fc56f5abd6cd1000d8d49a157adaaeb8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/pify?keyword=weight+bench+exercises+at+home+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external content. The presence of many links to Shopify domains, some with seemingly random filenames, indicates a link farm used for SEO poisoning or to obscure the malicious redirector.

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=weight+bench+exercises+at+home+pdf
    • http://files.ekleonline.com/uploads/1/3/0/9/130969265/79e8bf25.pdf
    • http://files.tminz.net/uploads/1/3/1/3/131383333/dutanimud-zasekuvaxiwopot-vejuzi-wagaguxajup.pdf
    • http://rasuja.heirtothechrome.co.uk/uploads/1/3/0/7/130775840/8a1312647cc.pdf
    • http://files.thickandthintheatreproductions.com/uploads/1/3/0/7/130740180/vowiro_degazufojepe_redunutudubufob_geten.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5533/0981/files/bsc_biology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/nibadujapisiloz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3766/2103/files/canons_of_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/vilofuxitowavonarilazaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/wosavukop.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/juxanusubavedawefokivanef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/komurevujopemefebuva.pdf
    • https://cdn.shopify.com/s/files/1/0452/6263/5168/files/entrepreneurship_course_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/jaritalivozemukedito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30899714004.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/27353850247.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/26714118543.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ab.bin
8831f885f9d7267bb06ee698895ee01e2a6f81c6543ca4922c7858ae4df77e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AB 5760 bytes
font_01_sfnt_off00007822.bin
b41a99d28a8d36884f26cce16504559dbca9ec8c45f9e5f9dfc84d2239044b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7822 10156 bytes

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