Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c18dca8a31d260d…

MALICIOUS

PDF

42.0 KB Created: 2020-08-03 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19d5a53643a6e96dcbbd5c8040fb1b3e SHA-1: 6a34340a19d0ba06c65e94974ae2eb6280f80bb8 SHA-256: 2c18dca8a31d260d13b8460a094ea2513d43c1d7e2780164e02d4a42c5be326e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites. The primary malicious URL identified is https://ttraff.ru/pify?keyword=fs+240+pdf.

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=fs+240+pdf
    • http://files.popworms.com/uploads/1/3/0/7/130776295/f2fff.pdf
    • http://files.chrisadamspersonaltraining.com/uploads/1/3/0/9/130969507/tobokul-xavesal.pdf
    • http://files.girlindia.co.uk/uploads/1/3/0/9/130969551/0241dcd.pdf
    • http://files.gay-lesbian-retreats.com/uploads/1/3/2/6/132696018/vofugerepamosen-fupawejewuvizuf-feruvaf.pdf
    • http://files.davisfamilyatdeanpark.com/uploads/1/3/2/8/132814518/wowuxesenanen.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/70216592512.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/dofogasemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/lenifak.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/bojoditomix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/ziraxizopebixagatogevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7188/files/99733424161.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/55973634615.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1665/files/basic_atomic_structure_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/penuvatefixaxidulobapek.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/10566487934.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/sevubopajofejupan.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/nunekakezogifukojag.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/cookiezi_skin_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/17914101054.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/68851772533.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ef.bin
34481be0297678619624c1f7255a979da2d8b8c9cdf6a38db8cc5f9548efc830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EF 5012 bytes
font_01_sfnt_off00007729.bin
fe6e470b07ea0970a48ba24218d77d959d61bdee567e8dcb246341058bc93986		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7729 10372 bytes

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