Malicious PDF — malware analysis report

Static analysis result for SHA-256 158049c18d7604b4…

MALICIOUS

PDF

57.9 KB Created: 2020-08-20 23:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b97932e49b018abed36f77fd035d0320 SHA-1: 6b66e93f8d3a1320738c9339a3bd036eaf1d113b SHA-256: 158049c18d7604b4fe840fde00785344c077c98f03848a099dead40cadcd9f07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in link farming. The ML classifier also strongly flagged this PDF as malicious. The embedded content, while appearing as a cheat sheet, contains a URL that redirects to malicious infrastructure.

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=simple+blackjack+cheat+sheet
    • http://zenivan.trailbalzingamstaffs.net/uploads/1/3/0/7/130775052/d45d62119e8.pdf
    • http://files.ipmsorlando.com/uploads/1/3/1/3/131384777/remizabigem.pdf
    • http://files.westernsafetyservice.com/uploads/1/3/1/1/131163777/xubivevuxibewi-tosaseb-judane.pdf
    • http://files.plaincommunitychurch.com/uploads/1/3/2/3/132302999/589ecb5.pdf
    • http://files.imajicatheatrecompany.co.uk/uploads/1/3/0/7/130775543/sapidovomoxixop-mizuxa-rorekineluwukim-laguwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/arvind_mills_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/58747777186.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8358/files/80436295962.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/sonazesexepesawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1062/files/setefavutawesupifezive.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerivavegexem.pdf
    • https://cdn.shopify.com/s/files/1/0432/1116/1768/files/86627424807.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ledoviz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9643/files/bilog.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/xopegikirezolog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/noxipumoratopasiragulopi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008056.bin
9de497db5cde79d7e1b5d3be0a7a6537b8bbe3f0572a66e12214ac529c2ce51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 5460 bytes
font_01_sfnt_off000092c0.bin
f323fee8cec283b496ece8aff36aff10c4f54d453a0559483ec6bdfb55449cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C0 15016 bytes
font_02_sfnt_off0000c15c.bin
4d0b7fceb6e0b8544dba10d314310d86ee7e0ac375a8e3b5fd915ca5fa71995c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC15C 16448 bytes

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