Malicious PDF — malware analysis report

Static analysis result for SHA-256 88637505e263743a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-13 04:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 382cb3cde7b824b2538ba25769a6b5d9 SHA-1: 0a2d7bb878f4b5177c355d3ac08e38bfcacc2ba1 SHA-256: 88637505e263743aba99b4cef078e40af73ca4f666b754a08501741ef7e8c4a7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with redirectors or potentially malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=analytical+reasoning+pdf+nts'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous external links suggests a link farm or redirection attack.

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.com/pify?keyword=analytical+reasoning+pdf+nts
    • http://files.vanessablair.net/uploads/1/3/0/7/130775475/4970ab5b19346.pdf
    • http://namixevu.twincreationgames.com/uploads/1/3/1/6/131637240/8206763.pdf
    • http://files.linmog.co.uk/uploads/1/3/2/6/132682685/bigimemedunives.pdf
    • http://files.homemaintainers.com/uploads/1/3/0/7/130775046/sirerexidiba-jibejanexuv.pdf
    • http://files.rosegordon.net/uploads/1/3/2/7/132740594/852427.pdf
    • https://cdn.shopify.com/s/files/1/0429/6792/4899/files/steuerklasse_wechseln_nrw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nedodakamilutejevojive.pdf
    • https://cdn.shopify.com/s/files/1/0447/6734/6839/files/blank_space_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/3576/9497/files/36702547499.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/duwopiwexuruduzirofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/29373163557.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/relosudozulegaxemol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/finale_export.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/modle_attestation_d_hbergement_pour_visa_tudiant.pdf
    • https://cdn.shopify.com/s/files/1/0438/9208/0795/files/nimedo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/surovo.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_off0000639a.bin
0b174c1cde9451eadbc126cc010449ad2d4de0c555722ca7232dad022bc68a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639A 5416 bytes
font_01_sfnt_off00007615.bin
147b457626d8a5d464683531ec62f51feb72bb471a442f6eac84cb5de97fea05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7615 10240 bytes

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