Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ec3675a731a905…

MALICIOUS

PDF

66.1 KB Created: 2020-07-24 15:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d203477016274bb687401129a29282b SHA-1: cc15740d9bf77eb9a085e41ac93abeaaf77ae42f SHA-256: 68ec3675a731a9052484309daa06ea9b98b3603bba1d90dbaa1d9171e60fdc71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content from various sources. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially harmful websites.

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/wb?keyword=cirugia%20laparoscopica%20urologia%20pdf
    • http://files.dashpac.com/uploads/1/3/1/6/131607321/napopowo.pdf
    • http://files.bridgendrailwayclub.co.uk/uploads/1/3/1/4/131437535/tuzelifinaz.pdf
    • http://files.eurojpconsulting.com/uploads/1/3/0/8/130873807/patukivu.pdf
    • http://files.martapequeno.com/uploads/1/3/0/9/130969775/1971468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/98255103374.pdf
    • https://cdn.shopify.com/s/files/1/0433/4734/5573/files/18873583198.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/45994693208.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/lorirepomilisefeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/79671892418.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/rogokudumeve.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/99925126441.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/sulasobir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/vutufotov.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/25732602769.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/dugafujajokesumosijevadal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c500.bin
b5ec34d99f5e64496f76dbf6c2422c4471517d6d857964a678260a7f820473a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC500 4924 bytes
font_01_sfnt_off0000d5ca.bin
3a1df95be189f79278abc06fba04766e4dc8694d4b9b42a3cd48f7ab92b003bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10968 bytes

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