Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e485fa8bcd403e…

MALICIOUS

PDF

41.2 KB Created: 2020-08-05 03:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d7b1e130c096735a87171d59cf84c4e SHA-1: 983a4640b94938cfaf3b28b950dd88f2d4608cc3 SHA-256: 08e485fa8bcd403ea8dd0f3fc10d367c69acbb59a1699a1c99f5bd4cb31c6385
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=algebra+1+glencoe+mcgraw+hill+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and other PDF links, suggesting a coordinated effort to redirect users to potentially harmful content.

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=algebra+1+glencoe+mcgraw+hill+pdf
    • http://files.bobbyhyam.com/uploads/1/3/0/7/130738894/597cebf18.pdf
    • http://files.allsaintskeokuk.org/uploads/1/3/1/3/131398141/zokimukelexigo_basozosol_davojenusim.pdf
    • http://files.staugustinereed.org/uploads/1/3/1/4/131406365/bff03f630412099.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/xelasuxazikokite.pdf
    • https://cdn.shopify.com/s/files/1/0438/8985/2568/files/chinese_english_visual_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/vudeludu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3152/files/83747382090.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7807/files/mosemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/sojixogovato.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/probability_and_statistical_inference_hogg_tanis_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0432/9259/0236/files/71703952268.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/13000258872.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/busof.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/vikavenudedujikesulowib.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_off00006057.bin
f8d3e4a9d4787998454b527a858987f40b4948d8703af17518a05674bc65f31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6057 5664 bytes
font_01_sfnt_off00007387.bin
a13df1fc3924bc6b55ac3345105540cd5b6933915235fa999a3f14abffce2188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7387 10428 bytes

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