Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ee9c8ede5939ae…

MALICIOUS

PDF

41.5 KB Created: 2020-08-03 08:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5714e4ea0ffda6ab4bff9a14cd6e6c6 SHA-1: b872434f0ac02ae73f5c7332eb767ed8ba6b7581 SHA-256: 28ee9c8ede5939aee2a3a9f936834dc0b3853c20da048e5fffec80b1a050092a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a textbook download and the malicious URL. This suggests a social engineering attack aiming to redirect users to malicious content, likely for further exploitation 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.com/pify?keyword=advanced+engineering+mathematics+zill+pdf+free+download
    • http://files.benmoorestudio.com/uploads/1/3/0/7/130775263/fotepe_gunewaperojodap_jutoto.pdf
    • http://wegunew.johndalexander.com/uploads/1/3/1/6/131636664/2091787.pdf
    • http://files.enamelsbylinda.com/uploads/1/3/2/6/132681448/bukudomolaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/60806635307.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/bimasodonodovabiburuluj.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/sportdog_collar_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9734/1604/files/xuxikupafuzokisusig.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/fikisotajafej.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/11196127445.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/xobudeguwivamepanaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/3755/6889/files/55810674703.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/dodexasu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/vududadugiforakifaxoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/vejodoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/69854883805.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055b1.bin
9ff48e65d1ab64aa8ecd8ba2da84092b58eff8b8b850ce34f51cf31fdb1fc622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B1 5548 bytes
font_01_sfnt_off0000687e.bin
9f7139fb38901d0ad1d7c2cfe2a11d771887857cf9acb8fac27b1917f39fa053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687E 9928 bytes
font_02_sfnt_off00008a7a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7A 4324 bytes

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