Malicious PDF — malware analysis report

Static analysis result for SHA-256 640e203f3bdefa8b…

MALICIOUS

PDF

62.5 KB Created: 2020-08-03 21:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7af8c133112b4689cf78eed3b547266b SHA-1: c7249fbd958e71f6b44abfa22fa052b4196f8c70 SHA-256: 640e203f3bdefa8beaebe1035d825c743bc50e8ac0b22244290e4867b0b4e7ed
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to 'physical science grade 12 definitions pdf' and the authoring application, suggesting a lure to disguise malicious intent. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence score support the malicious verdict.

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.com/pify?keyword=physical+science+grade+12+definitions+pdf
    • http://files.rare-prints.com/uploads/1/3/1/3/131383456/5926186.pdf
    • http://files.cocinamarineslares.com/uploads/1/3/1/6/131637631/nadevewomitojuvalo.pdf
    • http://files.averagemanoncampus.com/uploads/1/3/1/4/131454699/7298932.pdf
    • http://files.chezthuy.com/uploads/1/3/0/8/130874110/bopiwe-retozixawobabu-tutapujev-maneta.pdf
    • http://files.scpwdc.org/uploads/1/3/2/6/132683140/2245369.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3837/4050/files/68890049663.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/baxter_state_parka.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/pilefavijedododivojit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7654/files/30998794874.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/bhutan_travel_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/php_force_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/kimegazuperelagimimuxebi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/87711757314.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/lapaseb.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/35005091531.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/nimazonadosigofadutawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/kurunib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/jukukijokagunizig.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/wedizetax.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5d7.bin
43779abd33f0b8944ee4b2a57fd834ba1b78fba6f2408b5a93514db371f3266d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 5704 bytes
font_01_sfnt_off0000c952.bin
36c7cb6d06671434b7706eaebca98cbd7afe6f4d970237dee169f0e63365527f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 10292 bytes

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