Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dfc60238f2dbac…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 08:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b0c93d6f6659867cd372859eafd6ca SHA-1: 9c679113d7182b7eda9d2eacec4b51f9664e84ff SHA-256: f8dfc60238f2dbacd11ea29b3fcd2de1ef5837913f9b55e013bcfa448340352c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDFs hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru). Another heuristic flagged a large PDF link farm, suggesting SEO manipulation or a distribution mechanism for malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector suggest a phishing or malware distribution attempt.

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=promoter%20of%20a%20company%20pdf
    • http://bupeb.parttimenightjob.com/uploads/1/3/1/4/131437246/wijugazewavisumam.pdf
    • http://files.ccstudioinc.com/uploads/1/3/0/7/130776085/822972.pdf
    • http://files.owjfitness.co.uk/uploads/1/3/2/3/132302870/9149900.pdf
    • http://siguf.twisterchasers.com/uploads/1/3/1/3/131380582/542406bf8.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/silkcraft_freezer_paper_sheets_a4.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/kifawavujekaniwurufo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/types_of_software_in_computer.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/vesozadiretuzuwitefuwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/xibigipavusixovebafavivib.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/booth_s_division_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0431/9933/2516/files/alfabet_grecki_wymowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/neveguvesufof.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8440/files/97082380361.pdf
    • https://cdn.shopify.com/s/files/1/0444/3960/1318/files/pasipabef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/84639161098.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/goldfinch_by_donna_tartt.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_off00005c99.bin
91d910f5974f28ea72802d7c73db9d3f3ad4566c37d6225b746aa9a60992a6d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C99 5196 bytes
font_01_sfnt_off00006e2f.bin
feb9efb9bfa32f99880d968977580a807902ea6ff45cfa24e22e0dd1aba40ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2F 10144 bytes

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