Malicious PDF — malware analysis report

Static analysis result for SHA-256 c020d9e7555c8beb…

MALICIOUS

PDF

53.5 KB Created: 2020-08-03 17:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f778d5698b2ea3ba55b1b73ca739f4 SHA-1: b81c35e1ac44b664b5af3d1210b2415883265769 SHA-256: c020d9e7555c8beb226358badbe7bac4ccfa787861d8866c8dcb179af9637324
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.cc/pify?keyword=angelika+neuwirth+der+koran+als+text+der+sp%25C3%25A4tantike+pdf'. This indicates the document's primary purpose is to redirect users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=angelika+neuwirth+der+koran+als+text+der+sp%25C3%25A4tantike+pdf
    • http://files.ayrenmartinphotography.com/uploads/1/3/1/6/131607683/5156827.pdf
    • http://files.jhaytersmilestudio.co.uk/uploads/1/3/0/8/130814076/3464316.pdf
    • http://files.justdelightfull.com/uploads/1/3/1/8/131871864/tukutenineni-babegig-fopuzobaximas.pdf
    • http://files.farleycameronart.com/uploads/1/3/0/7/130775862/42cebc237570d.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/wawiditijunaxel.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/26935337283.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/50537812494.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/maxazazerar.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/fidenazopaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/5537/2695/files/40306316420.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/33298520568.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/21213811545.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6314/files/9633791455.pdf
    • https://cdn.shopify.com/s/files/1/0433/7011/9333/files/rugipepuvatuwafadeji.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/jevetuvivemim.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/pejonug.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_off00007f3e.bin
7de6d9e9db75db222be76b20daaa803b221b907574579d92f1d1cf6cdb4e83b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3E 5636 bytes
font_01_sfnt_off000091e9.bin
2cc325ed35f9f2e937ed7085b1c0560dcf7b07034dc9be0dc857c5dcb8c53b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E9 11584 bytes
font_02_sfnt_off0000b76a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB76A 4324 bytes

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