Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85d8eaf730ea319…

MALICIOUS

PDF

39.4 KB Created: 2020-08-02 18:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72e447ea231716c05f6f7b1729e605a SHA-1: 64067288a413f0cf0970b939f479f7945ffc36ea SHA-256: f85d8eaf730ea319713f3929b51d3141831c49f12816ecd6a5d4498d72512114
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=weather+for+newark+de'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to weather information and the redirector URL, reinforcing the lure.

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=weather+for+newark+de
    • http://files.top-tungsten.com/uploads/1/3/1/1/131164446/vuvifukuvoveramataw.pdf
    • http://files.kirifarms.com/uploads/1/3/0/8/130874691/7fe89e1cdd1.pdf
    • http://files.marvlindbergmysteries.com/uploads/1/3/1/3/131379312/tudap.pdf
    • http://files.mightyandmessylife.com/uploads/1/3/0/7/130739776/bitidenupawapokonezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/70154525668.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/13385999289.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/demubuxoverujosujawalivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/75635229315.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/lobibopibijuwakiduk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/61616244644.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/79589621581.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/welikit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/ds_action_replay.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/zujuraguduvupibotaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/dotudaritilifirabas.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/nolipekawotaranufibir.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_off000050fd.bin
d5f625f1f5863a8ddacc66935d61776953da2d6d9e6934c66a865ca41811ae2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50FD 4696 bytes
font_01_sfnt_off000060fc.bin
ebcddbf2f588607d7306976d0cfa6dfbb413dd364a7449b40805a6dea3bd00eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FC 9844 bytes
font_02_sfnt_off00008297.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 4324 bytes

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