Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1f11d6d3e0acc0…

MALICIOUS

PDF

42.8 KB Created: 2020-08-17 02:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a14a04656ffeb5ceba22a7e6d03a994b SHA-1: 2993a479857cc858743d26f934a6fa061f95e87e SHA-256: fb1f11d6d3e0acc034816c86fa114872f27760a52311f8ce9aca673d11831c42
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=free+solitaire+games+for+windows+7'. This URL is presented within the document body, disguised as a link to free solitaire games. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=free+solitaire+games+for+windows+7
    • http://files.littlelotuscafe.com/uploads/1/3/0/7/130775145/f889c0.pdf
    • http://files.medicareyourway.com/uploads/1/3/1/1/131164081/3315460.pdf
    • http://files.jpwillson.ca/uploads/1/3/2/3/132302919/3128903.pdf
    • http://rabawiv.yoonho-kim.com/uploads/1/3/1/3/131379552/0f5a8ef75dc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98012128422.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/how_to_kill_process_in_windows.pdf
    • https://cdn.shopify.com/s/files/1/0437/2375/1575/files/timawedesepawomelo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/english_grammar_worksheet_for_class_3.pdf
    • https://cdn.shopify.com/s/files/1/0449/2951/5687/files/90529093019.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/posemamusowowuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/faxazegumirululeleroki.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/83327005046.pdf
    • https://cdn.shopify.com/s/files/1/0433/9951/2231/files/59706294553.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/20291529322.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_off00006898.bin
c19409fb09df819094295fdcb78c62c3728999e36da612d5820f7de8b5967b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6898 5356 bytes
font_01_sfnt_off00007ad4.bin
03861585f00d878bb3667930199864909296e6bc1b40c20c7fdf395875ccc47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD4 10320 bytes

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