Malicious PDF — malware analysis report

Static analysis result for SHA-256 8559490dfee4be66…

MALICIOUS

PDF

34.1 KB Created: 2020-08-11 15:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50a9e5cdd4210188c74a4b110afe1dcb SHA-1: 1032a5287090ebfd61e17b5880a87f7c112c6deb SHA-256: 8559490dfee4be662308fa740c5193bcec3dc8d2d7cfa5db1f9404c8a2e5d538
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=caribou+menu+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking PDF filename, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted from this sample.

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.cc/pify?keyword=caribou+menu+pdf
    • http://files.sergeypolstyanoy.com/uploads/1/3/0/8/130813364/8952842.pdf
    • http://files.stonetreematerials.com/uploads/1/3/1/1/131163957/35aaee013.pdf
    • http://files.hombomtoys.net/uploads/1/3/1/3/131383949/joxixurifuweval_tofofenidofe_refoda_fakew.pdf
    • https://cdn.shopify.com/s/files/1/0432/4442/1282/files/vikapubitarasedi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/conjunctions_in_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/47426829006.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/62591230430.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/delonghi_espresso_ec_155.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/86831291157.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/70255686383.pdf
    • https://cdn.shopify.com/s/files/1/0437/0651/5611/files/nudodif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73768917897.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/sunorurimuzegeditutufez.pdf
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/16520074357.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_off000047a8.bin
66b4efdf30f3ad0bf1e079542e1858f81eea6cebc3b85ba0ad5d89f878dd0147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47A8 5024 bytes
font_01_sfnt_off0000589b.bin
d93d534e9cca52b234f12b7c113befa5399502a6a38925062e4d032636a478a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 9960 bytes

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