Malicious PDF — malware analysis report

Static analysis result for SHA-256 626091f6f65f1352…

MALICIOUS

PDF

56.6 KB Created: 2020-08-08 09:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2edc884b261ee1e6633d4d1028f4bfa9 SHA-1: 435e9381644cb9577789df0e2cd8340b6a935d9e SHA-256: 626091f6f65f1352a3d809f22995578008a12c49be2bc394f817a8321e74fcbd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics, suggesting an attempt to drive traffic to malicious infrastructure.

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=baldrige+model+pdf
    • http://files.cityofpoulan.com/uploads/1/3/1/1/131164117/maliwosuta_xitubed_legazuzelove_mumoli.pdf
    • http://files.southgwinnettfootball.com/uploads/1/3/0/9/130969301/eed865c1cd4203.pdf
    • http://files.smartrevivemobile.com/uploads/1/3/2/3/132303229/8755340.pdf
    • http://files.leadfromhere.com/uploads/1/3/1/4/131438190/9979084.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/58900517716.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2376/files/26196885597.pdf
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/58276948511.pdf
    • https://cdn.shopify.com/s/files/1/0432/4691/1643/files/1451986557.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/24851381925.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/73018940716.pdf
    • https://cdn.shopify.com/s/files/1/0437/6343/3629/files/middle_cerebral_artery_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/levijaretakarobebojo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/xexolameraluvekiwidupex.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5591/files/bebitorumewafokepini.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/jaquar_sanitaryware_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/0747/4844/files/34120988781.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/ruzatuzubizedivu.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_off0000a03f.bin
f9218f4def1056fa5b6fe18df609296a279ae1450001911ab216c094ec1cea1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03F 5232 bytes
font_01_sfnt_off0000b1fa.bin
1d517839033e452e8b6b63d58a29b390b3b1ad5b9745fb6d55fb34d8b45e7c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10540 bytes

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