Malicious PDF — malware analysis report

Static analysis result for SHA-256 f926cbda86334bcc…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 21:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aee787124f1a3ed862391736402083b SHA-1: 80b8c58f8416b3ad70d4b1bf6ab39aa90fc5edda SHA-256: f926cbda86334bcc368ac485894b35d6a5d106e5248d3bc326b1ea3d979630c9
120 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and keywords related to educational worksheets, indicating a lure to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be the redirection 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/wb?keyword=midpoint%20of%20a%20line%20segment%20worksheet%20pdf
    • http://files.healthyfitlife.co.uk/uploads/1/3/2/6/132696030/xiduzaxazed.pdf
    • http://files.swta-cta.org/uploads/1/3/1/1/131164117/zufug_kamuvuwa_piguxo_xubarorugefote.pdf
    • http://files.northshorehomes-seaside.com/uploads/1/3/2/6/132696145/mufeve.pdf
    • http://files.oregonbda.org/uploads/1/3/1/3/131380469/betalirezubeki_gemaga.pdf
    • http://files.sspinc.org/uploads/1/3/0/7/130776206/muxemasalugodisun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/fozob.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/xejiriru.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/20264776764.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/89551127913.pdf
    • https://cdn.shopify.com/s/files/1/0439/2691/3179/files/astral_projection_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/75964866744.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/79849780770.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5089/files/podanozikobiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/79201663020.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/95233686812.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/mac-_address_vendor_list.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_off00005e18.bin
647b6f509605906705388c4a51854fe9679a1c6c1736a449ddb1de85e63a4d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E18 5616 bytes
font_01_sfnt_off00007130.bin
3a24346bc4b47ef480042ce07cdabd758162352a1549a7eba66a0f2ed88f7487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7130 10672 bytes

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