Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaaaed442f126d7f…

MALICIOUS

PDF

52.2 KB Created: 2020-08-13 23:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22dd7b5535b55aba957eba974fcc16fa SHA-1: 41107dde3cf820e6bff8c0f869b83c4b4105c93a SHA-256: eaaaed442f126d7f2fad8d65150ff65b7f0f178e1b40408fcebafb3f917b127d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=buried+child+script+pdf'. This indicates the document's primary purpose is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the redirector and the link farm suggests a social engineering attack to deliver a secondary payload.

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=buried+child+script+pdf
    • http://darapaxug.tree-ditions.com/uploads/1/3/0/7/130775350/d5fd330c.pdf
    • http://files.librarywithoutdust.com/uploads/1/3/0/8/130874544/958952.pdf
    • http://xafaxemas.pittrelive.org/uploads/1/3/0/9/130969723/f2d7eb2b99.pdf
    • http://tivamipi.hodgmanliterary.com/uploads/1/3/1/3/131383483/1d7567b35.pdf
    • http://pepataj.artawol.com/uploads/1/3/2/8/132816117/lurix.pdf
    • https://cdn.shopify.com/s/files/1/0438/4869/5958/files/gugobagefevejagar.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0619/files/reliability_centered_maintenance_training.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/goxujifopunevewivowizi.pdf
    • https://cdn.shopify.com/s/files/1/0450/6681/3590/files/baby_booties_crochet_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8244/files/vipita.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/49814849134.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/14331403111.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/72110062884.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/lajagefavufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/fuzagu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/63252614205.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/employment_contract_qatar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69298849274.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fd7.bin
a173d60c4f81d756fe21d1b126520ac5b9790ac10cc7945b67983d57ca1f4315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD7 5084 bytes
font_01_sfnt_off0000a11a.bin
bd3cde47c65850b28dac11e8d89b0d6b86eaa747eab9c4eb6eb7246aa79b9236		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA11A 10192 bytes

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