Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d51932d486cd7a…

MALICIOUS

PDF

52.9 KB Created: 2020-08-09 04:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18107c41428622324fa5326e4cf10427 SHA-1: 06cfb22e8eaadbe17e7e15335be1703fa5d89f56 SHA-256: 26d51932d486cd7a7a3b745c401bf33d0521131c26b53ec8a86fd5b6206b6190
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to attract search engine traffic. The primary malicious URL is https://ttraff.ru/pify?keyword=java+spring+mvc+tutorial+pdf, which likely serves as a gateway to further malicious content.

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=java+spring+mvc+tutorial+pdf
    • http://files.my-h-anonymous.club/uploads/1/3/0/7/130740625/zeregufunad.pdf
    • http://files.ascensionretreats.com.au/uploads/1/3/1/6/131637081/8710105.pdf
    • http://jopiz.techtalkpd.com/uploads/1/3/1/6/131606490/sovimivonunu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3045/2123/files/kesumigewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/57822242476.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/90459191756.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/vufuzeguxega.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/53897748578.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/six_sigma_black_belt_project_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/60616170331.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/politica_de_calidad_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/boeing_737_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/dorefetavemogad.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/rakuzisatesakijijolemivax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/70374633627.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ad.bin
0c0a6b196b5c4b0d5794dd6238835f8a7febc6a970ac95f69301f79017ac7ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AD 5524 bytes
font_01_sfnt_off00007767.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7767 1800 bytes
font_02_sfnt_off00007ff5.bin
77dcdf111877a0bd8814ff204539377ece079cf837865efb032f9e1fbce92bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF5 15704 bytes
font_03_sfnt_off0000b0c4.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C4 16204 bytes

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