Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cff7f47ca17b6ba…

MALICIOUS

PDF

50.7 KB Created: 2020-07-31 18:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2acd371e403087d085313985882421d SHA-1: d0706ff3412da070c9846c195b9a4a54965b8aa9 SHA-256: 0cff7f47ca17b6bac822b871adf239631b973e048e4873b81ada8bb4e46f83da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for a printer manual, likely intended to trick users into clicking the malicious links. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead users to harmful content.

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.ru/pify?keyword=brother+mfc-+7860dw+manual+pdf
    • http://files.deanedancecenter.com/uploads/1/3/0/7/130775607/delijotonanozulusu.pdf
    • http://files.yennang.com/uploads/1/3/1/3/131379059/820fe.pdf
    • http://files.farhillaussiedoodles.com/uploads/1/3/1/4/131454670/98e3532721.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/39963988273.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/kutiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/kusuremifafe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9590/6721/files/43193684435.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/sefukageputidasixodexeme.pdf
    • https://cdn.shopify.com/s/files/1/0436/9265/4745/files/34924011959.pdf
    • https://cdn.shopify.com/s/files/1/0436/4579/6512/files/rojigikabafowonixavobaser.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/losokiwi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/5725231152.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000733a.bin
1af1fdb02f150e4b7fb9ab825036f356033ef8d1f6adfeb519aebbff9637efeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733A 1724 bytes
font_01_sfnt_off00007bc6.bin
250651c0b19a90d41aca396a8f1eee14654a82c26da61326392d27634afac8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC6 5960 bytes
font_02_sfnt_off0000900b.bin
a858570a09775f03ca9aee4331d2d7504bbe1e6e84e1456bf00f93fc4d039d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900B 14380 bytes

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