Malicious PDF — malware analysis report

Static analysis result for SHA-256 213b79ca3aa665f1…

MALICIOUS

PDF

49.6 KB Created: 2020-08-10 05:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3dac7cb24b8ab2890cdb431d21ecc2 SHA-1: 931799de5053d6cc558a8918812e95b8572c6d2a SHA-256: 213b79ca3aa665f1a81fc14cca9baea5ae0a7a86e21b86fc03aaec60686200d3
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on Shopify, designed to appear as legitimate resources. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is likely the primary malicious payload delivery mechanism. The document body, though heavily corrupted, contains the target keyword 'cambridge english advanced 2 examination papers with answers pdf', suggesting a lure to attract users seeking study materials. The ML classifier strongly indicated maliciousness.

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=cambridge+english+advanced+2+examination+papers+with+answers+pdf
    • http://files.lovekbeauty.com/uploads/1/3/2/6/132695418/9275083.pdf
    • http://files.firpoint.net/uploads/1/3/0/8/130813906/a42b541d2.pdf
    • http://files.alexmunroewrites.com/uploads/1/3/1/3/131384173/fovun_jixototedu_pojutebuvatevu_vibul.pdf
    • http://files.jlongkandb.co.uk/uploads/1/3/1/6/131606368/da1337258866eff.pdf
    • http://files.mustardfitness.com/uploads/1/3/1/3/131383763/nategexo_jidonamonewi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/gijajoratejevepetuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/adverb_and_adjective_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1739/4586/files/61982643292.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/6629363238.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/66979870203.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7980/files/33894454379.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/kilupojetevidujomerisipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/gubotixidoliwijaxar.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/dainik_bhaskar_epaper_patna_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/rapegajaworobofozipim.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/25466025784.pdf
    • https://cdn.shopify.com/s/files/1/0433/9944/6693/files/vijagunorupob.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/47693227513.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_off00006dc3.bin
27c92fd300379e619c15ad1d27c0d7d1ab00cbcf0674b51f1b151fc1d29f0bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC3 5964 bytes
font_01_sfnt_off000081f7.bin
97fe74925f1ec5fab673289da89f2c0c4b50eb8141635a9bece8d063dfd5a293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F7 18176 bytes

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