Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c56abb71c59794…

MALICIOUS

PDF

39.2 KB Created: 2020-08-14 19:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e41455cf201325ebeee010f20989638 SHA-1: 7cff3f49d5a3e7a3b92a9f2fd844442632ae16c8 SHA-256: b0c56abb71c59794ba981aa77a23cfd5c266cba0773877ebd02e9b7cc2a0a524
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'English worksheet'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility.

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=directions+english+worksheet+pdf
    • http://files.buttecollegebcea.org/uploads/1/3/1/4/131453998/2695778.pdf
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/kobobab.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/81792278975.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/9652399929.pdf
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/21543852931.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/technical_drawing_basics.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/xunuxasakuxelerovipazara.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/is_wondershare_mobile_transfer_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7541/1872/files/61974536825.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/voltaire_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/nudafobidarutisej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/7515021105.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/40437360773.pdf
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/katifobuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/lulisirumolukuken.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_off00005b7e.bin
a4d1881d24086814817db89760504acf6a0cb23f7867e16dc63655c61380adf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7E 5360 bytes
font_01_sfnt_off00006dc8.bin
cec56a032bb5757bef409517c087b17ee8a725dbb23ad2af0c23a639a8c64bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC8 9996 bytes

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