Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d81dcc9b9ab1d4f…

MALICIOUS

PDF

81.8 KB Created: 2020-08-05 09:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8720cf66a2d3a20a6cf122ddb675cc5 SHA-1: bc3f1b8f0dd0b575e39d79c7874d5f29cab7524c SHA-256: 5d81dcc9b9ab1d4f680ef6a9405fc3f3a966f019a0808ac3b29c95833755d8a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=nitrogen+cycle+pdf+file', which is likely intended to lead the user to malicious content. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially to mask malicious activity.

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=nitrogen+cycle+pdf+file
    • http://files.freshexpressionsllc.com/uploads/1/3/1/6/131606366/dbd823c445.pdf
    • http://files.iancleggwalsh.net/uploads/1/3/1/3/131384468/nibexiwe.pdf
    • http://files.wheelmanspokane.com/uploads/1/3/0/8/130874015/7641838.pdf
    • http://files.konishi-kg.org/uploads/1/3/1/3/131380591/jezaxikasawib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/7859321899.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/osrs_black_demon_slayer.pdf
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/10016614213.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/gw2_tailoring_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/tofuked.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/13240989009.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/19685749436.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/26533391401.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/nj_practice_driving_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/bepenezawazumedim.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3829/files/10572955485.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f8.bin
933392aac630ab5aec4aed135fbc1bd3628422e0a44384834e7fd373198db26d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 4796 bytes
font_01_sfnt_off0000f363.bin
f9931758005af0c97db7c1ca02d5f3d6aafe5efd493eeb3373a6cf3ee6254615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10456 bytes
font_02_sfnt_off00011758.bin
2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 16060 bytes
font_03_sfnt_off00012bec.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 4324 bytes

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