Malicious PDF — malware analysis report

Static analysis result for SHA-256 91418966d2168b69…

MALICIOUS

PDF

44.0 KB Created: 2020-08-22 06:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64f04e1748a033ec004d67cedc8a697b SHA-1: b01c986e508c34dd6e2d381e3ba73b316ce027b6 SHA-256: 91418966d2168b69b1dd60a1b7af8ebbc0dc3a98c678832de180b38b4386449b
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to traff.ru, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. The file is generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm heuristic.

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=esvs+guidelines+aortic+aneurysm
    • http://rivupa.higherlevelevents.co.uk/uploads/1/3/1/1/131164250/7367124.pdf
    • http://files.bergenphotography.net/uploads/1/3/2/6/132682204/1172733.pdf
    • http://gilir.questioncircumcision.com/uploads/1/3/1/1/131164110/rutidulanolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/50584875963.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/31471906547.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2004/files/package_mockup_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/60858869944.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/gezilizegujeka.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/72487313350.pdf
    • https://cdn.shopify.com/s/files/1/0433/1539/6776/files/root_software_for_android_5._0_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8417/5773/files/design_thinking_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5798/files/been_or_gone_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/xirasexitabeluvupuseruk.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/fedukelijopobozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/kofukefo.pdf
    • https://medlineplus.gov/aorticaneurysm.html
    • 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_off00006e59.bin
12c81a761fdab8d72afc639fd6b27d3a7721f8665c1cbd4f66f98b624564fc17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E59 5380 bytes
font_01_sfnt_off00008098.bin
d9d19a2bff67551c59259746181dff4344dd3246d1659378b73bb15cb5d61e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8098 10048 bytes

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