Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad47cecb26f38fce…

MALICIOUS

PDF

40.0 KB Created: 2020-08-03 15:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57e0135cfc86e60ee32d7f76f13eae4 SHA-1: f0e9f57699b8b2c3ea01a349db14fef89776225f SHA-256: ad47cecb26f38fcee05db4975c8af20790e42ec21069ebd5c669c04febb7fc71
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The document body contains the URL 'https://ttraff.ru/pify?keyword=html+link+to+pdf+not+working', which is also listed as a known malicious redirector. The presence of numerous Shopify-hosted PDF links, while some are benign, contributes to the overall impression of a link-based attack. No scripts were extracted from this sample.

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=html+link+to+pdf+not+working
    • http://files.masalafusion.net/uploads/1/3/0/7/130775182/cc447a1.pdf
    • http://files.floridalivesound.com/uploads/1/3/1/3/131383384/70b20bf7ba935d3.pdf
    • http://files.wabauer.com/uploads/1/3/1/4/131406741/wotiz_lebibatuvumud_zozoni_tirip.pdf
    • http://files.marylandbuilders.org/uploads/1/3/2/6/132681194/vadigux.pdf
    • http://files.kimce.org/uploads/1/3/1/4/131437229/3143ec11d9c.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5610/files/hnet_jobs_guide.pdf
    • https://cdn.shopify.com/s/files/1/0441/1051/2280/files/39951271916.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/rupemunevez.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3418/files/24641555389.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taniseraguvifololesugom.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/suzudanigalazazovuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0267/4845/files/kevidarek.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/kudel.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/92336336598.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/gijutifizup.pdf
    • https://cdn.shopify.com/s/files/1/0440/8400/2981/files/xulenufafeza.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_off00005fe3.bin
899b7e0ad419c65c4da65779bcac72af3186ab4ee4bb5658461fff73a09dbf10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE3 5088 bytes
font_01_sfnt_off00007131.bin
7bc3bba3ea29215df9334b86edc8c9410b66a3d5c09015f5b9e1ca18b3cc07f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7131 10032 bytes

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