Malicious PDF — malware analysis report

Static analysis result for SHA-256 888e34f6cf0c0598…

MALICIOUS

PDF

44.1 KB Created: 2020-08-10 04:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ace0738c58406bd87e0550a0f1aceb5 SHA-1: 7c43069ac3aa2319558065116042d3c21950e311 SHA-256: 888e34f6cf0c05987ec3d6a30405b6d09ff91b56d435b78881898db9bee6eb00
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirector strategy. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to traff.ru, suggesting a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains the URL that triggered the redirector heuristic, reinforcing the attack pattern.

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=afrikaans+to+english+lessons+pdf
    • http://files.harlowrockschool.com/uploads/1/3/1/4/131483098/4414275.pdf
    • http://mogunit.eveningstreetharriersxc.com/uploads/1/3/0/9/130969723/ropen_xetolonipowag_mirowinefidava_najixalupoj.pdf
    • http://files.ashgateheritagearts.co.uk/uploads/1/3/0/7/130739238/ridozipabolute_rejeger_fifuximuxato_dedome.pdf
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/fizifumomemodano.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/borafirawurepezemuwopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/96939535875.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/10497607956.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/duzoketazixogasiragugukoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/cfa_program_curriculum_level_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/kuvenonuponafatan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/46453321815.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9945/files/97675931230.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/body_parts_label_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/5916186028.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/puxiselalixabudobukosivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/82889654832.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_off00006eaf.bin
86263c12e79c615d1238bf124051c32b7490811024281c4518e87ee716546048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 5356 bytes
font_01_sfnt_off000080e4.bin
12efb9f9b14292fe2809f5bb077c581a04a1f62c1cc8f86247b1a3b7417e3856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E4 10264 bytes

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