Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e84d41aaf2d454c…

MALICIOUS

PDF

51.0 KB Created: 2020-08-08 16:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d86bcaaefa3f532c59855355e58533 SHA-1: 54c0b67467864ddc381841415b87740058d17724 SHA-256: 0e84d41aaf2d454c14095376442fc0e429142c2ebe1ce2e2e8b0d2b05def839a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'artificial intelligence course study material pdf'. This URL, https://ttraff.com/pify?keyword=artificial+intelligence+course+study+material+pdf, is likely intended to trick users into downloading further malicious content. The document also exhibits characteristics of a link farm, with numerous external PDF links, many pointing to benign Shopify domains but some to unknown or potentially malicious hosts.

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.com/pify?keyword=artificial+intelligence+course+study+material+pdf
    • http://rubuwubo.courtneysaul.com/uploads/1/3/1/4/131482975/4003808.pdf
    • http://files.nathonkelley.com/uploads/1/3/1/3/131380754/mukugavaza.pdf
    • http://files.islandtransfers.com/uploads/1/3/0/7/130776326/fanudesomuwevekonezi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/tutorial_aspen_plus_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/sudibuvoxefuneluwegebi.pdf
    • https://cdn.shopify.com/s/files/1/0436/6735/7846/files/sanunojokefakapinemikiji.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/kozutogomaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/9150/0961/files/63962924503.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/47284561938.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5873/files/convert_to_word_free_download_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/79427738522.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/mebibozimokelopepunewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/67904356297.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/3092924537.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/95525782292.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_off0000834e.bin
142e1cac92aea340d8d69d6d6db6dac03b64788ba6a61495d1cf38abbb15c5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834E 5564 bytes
font_01_sfnt_off00009631.bin
f2ee8633ad4514eb91572c2d646b4fbd7afd1c8c3ae8921617648eb60d376033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9631 12660 bytes

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