Malicious PDF — malware analysis report

Static analysis result for SHA-256 210a8d0cb59c1b55…

MALICIOUS

PDF

50.1 KB Created: 2020-07-29 11:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3239aa5afb0785b2468a92bde9a7af7f SHA-1: ad52dbd7167cfed0631e19c3646ab8496a3a8c39 SHA-256: 210a8d0cb59c1b551df1921f8173c1aaf30ffd231937a978a3348fd25f163f77
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'Javascript tutorial pdf for web designing'. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

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.cc/pify?keyword=javascript+tutorial+pdf+for+web+designing
    • http://files.camelliacharlesjewelry.com/uploads/1/3/0/7/130740069/197bff0c.pdf
    • http://files.sylvielarimoredelara.com/uploads/1/3/2/7/132712282/gegatoz.pdf
    • http://files.estateandco.com/uploads/1/3/0/8/130874295/654c16fa8269.pdf
    • http://files.scottbrianhewson.com/uploads/1/3/1/3/131383698/vuvozilapoviput.pdf
    • http://files.blackwolfknives.net/uploads/1/3/1/4/131438784/7404327.pdf
    • http://files.camelliacharlesjewe
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/vakebifilelajux.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/latusiroxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/8243770942.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/dawetuwuzusaxeravubem.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/naxarasorinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/58585201877.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/28148062701.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7741/files/kojivasako.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/71544474187.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/xarekidovev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/64023710800.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/polosofipovuwifupubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/wiwigaminopoduginen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/vebul.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_off00008559.bin
c8a6251080cc06c3fef37a1edce949779a01916af1ff86bfa85a976e4edc17e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8559 5484 bytes
font_01_sfnt_off00009819.bin
39be983a04b2f733d355e09df875586fad5e5aab86802ce55163b8f752468cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9819 10160 bytes

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