Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bc9a1228a6d8fc…

MALICIOUS

PDF

42.2 KB Created: 2020-08-20 20:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 910fe9280d69b86abc2d5c7b7cdcbfe2 SHA-1: fc1a4fe9e2ce478b1a533197eee2a4f475661790 SHA-256: a7bc9a1228a6d8fc07d0b90c42638ad00c98ca8d02b101fe7c18654e74b0b9d6
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to Shopify domains but are likely part of a link farm designed to obscure the primary malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=calendar+worksheets+for+class+2 as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect users to malicious infrastructure.

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.com/pify?keyword=calendar+worksheets+for+class+2
    • http://vilite.leanwithluke.co.uk/uploads/1/3/0/8/130874575/6249439.pdf
    • http://files.creative-tree.co/uploads/1/3/1/6/131636728/ac97e043.pdf
    • http://fumud.conductorbeverlytaylor.com/uploads/1/3/0/7/130740514/pevuzudabax.pdf
    • http://files.josepblas.com/uploads/1/3/1/4/131437268/kiwinorubidosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/berapolor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15843942414.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/kevuwipozolelifozoragawi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1065/2317/files/gujipilidajapap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/gatodefemozugeva.pdf
    • https://cdn.shopify.com/s/files/1/0439/4100/3432/files/steelseries_arctis_7_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/70972033130.pdf
    • https://cdn.shopify.com/s/files/1/0438/4548/4706/files/mac_pro_longwear_concealer_shade_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/54277156543.pdf
    • https://cdn.shopify.com/s/files/1/0438/9981/4040/files/essentials_of_clinical_infectious_diseases_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/xekeraxixubilokadije.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/39256232157.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_off000066f0.bin
5de0b008002de3e6f14f350d981f34f1d399847e0a3ac4faec3917cdb422e8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F0 5304 bytes
font_01_sfnt_off0000790a.bin
ba6f9d7a2605a1367813d8975fcc14976e2491410bd51db5601ad4a45980df08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790A 10308 bytes

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