Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4ecdf1940ccd39…

MALICIOUS

PDF

81.5 KB Created: 2020-08-21 10:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161ceac745bc17bb094b6e6708e972ce SHA-1: 9f965a7291fd7abbcb83076e795024a528fb6fc7 SHA-256: da4ecdf1940ccd3942e427719776d49a4107a20616c17dc28daee426974772cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a 'Restaurant guide michelin paris 11', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including a 'link farm', indicates a high likelihood of this document being used for phishing or malware distribution.

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=restaurant+guide+michelin+paris+11
    • http://bipafi.nwenergy.co.uk/uploads/1/3/1/0/131070109/3c69d2c8f7b038.pdf
    • http://juxasi.vladimirblagoev.com/uploads/1/3/0/8/130874493/loxobopi.pdf
    • http://files.communitychurchsheppey.com/uploads/1/3/0/8/130874318/49948dc.pdf
    • http://files.jsuhonorband.com/uploads/1/3/1/3/131397987/disawelesefuguz.pdf
    • http://files.triumphofmercy.com/uploads/1/3/1/6/131606284/9145338.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2231/files/honeywell_thermostat_manual_rth230b.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/jamamewaxefa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9748/7512/files/79731882907.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/mabenuxovufevow.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/vajexafavumojorida.pdf
    • https://cdn.shopify.com/s/files/1/0435/1043/1896/files/7868432417.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/63648771520.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/29690851490.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/22986128719.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/notebedatinekuvo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3791/files/canon_cd_printing_software.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6275/files/buwozigalazesotuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/15358994307.pdf
    • https://cdn.shopify.com/s/files/1/0435/1901/7124/files/nopukutese.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/26703390392.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_off0000b4e3.bin
8048c0d94504860cf659d8d674bd760f90e60c7edb996eb8d9852222a1b1b358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 19284 bytes
font_01_sfnt_off0000f251.bin
a1571c14717ca09818295b17c612d9ab7e16c5b8f55299b1e6566265185951f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 5316 bytes
font_02_sfnt_off00010437.bin
bf3fc10d6cb13cde1969fd8727c88d33a945bf4e7d71f5b72547e4ae923901b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 11152 bytes
font_03_sfnt_off000129cd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 4324 bytes

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