Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b730b104295d9c8…

MALICIOUS

PDF

43.4 KB Created: 2020-08-01 13:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fca99fa308963a12f89742db823a797 SHA-1: a9a09976aa7c7eb74faa02e2c4ae10ef56dbd948 SHA-256: 8b730b104295d9c84c144401feae89e2b472c39107eb2b09ff00aa5e45ad9ae1
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=technical+mathematics+with+calculus+pdf', is known to redirect to malicious infrastructure. This suggests the document is designed to lure users to potentially harmful websites under the guise of providing academic resources.

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=technical+mathematics+with+calculus+pdf
    • http://files.chapelbythelake.net/uploads/1/3/2/6/132695493/feliju.pdf
    • http://files.carsandcrochet.com/uploads/1/3/0/9/130969220/duxizexat-bukepasijusitu.pdf
    • http://files.theclimbingdietitian.com.au/uploads/1/3/1/6/131607075/93bd99fda3fbf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/kingdom_hearts_2._5_puzzle_pieces.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/ladikalusogutonajiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/50241472935.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/11873121646.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/dabirasifumuxelawif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/foxumijezapulupefipifa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/7784874478.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/7143676299.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/3533756466.pdf
    • https://cdn.shopify.com/s/files/1/0434/2887/2359/files/mibuzuzisuvomamiw.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_off0000615a.bin
623c39df3e0fc196e695d3a57b369022f7fe985bc57b99b13229f4469624d568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615A 5340 bytes
font_01_sfnt_off00007374.bin
a3b0f0b52ced00289c7d0e5ae329fd30fcd209fd7120825a5d9a8243ee3ca14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7374 13852 bytes

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