Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3997f18c94dab13…

MALICIOUS

PDF

66.7 KB Created: 2020-08-08 08:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfe9c16218537844523da6c98a5939c5 SHA-1: a627266f00440b77d2083672baa82cba8056fa76 SHA-256: b3997f18c94dab13b186998905275016cdd276e283a35d65ab8d1b2ed0c87c54
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, but one critical link redirects to `https://ttraff.ru/pify?keyword=arithmetic+mathematics+book+pdf`, which is identified as malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'arithmetic mathematics book pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=arithmetic+mathematics+book+pdf
    • http://files.cougarstrongracing.com/uploads/1/3/1/3/131378990/rakotaziwogatavo.pdf
    • http://files.mralder.com/uploads/1/3/0/9/130969855/sideganojufaze_xukitusas_faxabuxovi.pdf
    • http://wusom.wbdesign.info/uploads/1/3/1/4/131454012/e401bed.pdf
    • http://xolod.spotupshooterproductions.com/uploads/1/3/1/3/131383314/e468b65caf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/95713665033.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/xevotepetoruwokutuvojizu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/voredaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/66205842179.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/lightning_protection_system_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4515/files/88567632980.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/82183680909.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/tamufuxugepopizafez.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/dipenufele.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/babexumisajedojates.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/20332393160.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/43150539275.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/86156140022.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_off0000c91a.bin
e1d84260c90dae7659063b9a48f0ad600fb5076d3641a93ea8e62d84bacd41b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 5556 bytes
font_01_sfnt_off0000dbcf.bin
58511f9211719b72e9eecd155b8ddbe4eda31720516ebeac64aa3cd848899562		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 9888 bytes

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