Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7453e404f80b3df…

MALICIOUS

PDF

50.1 KB Created: 2020-08-17 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9452bf8aa2a86728dbcfe434b97ac706 SHA-1: 3f1175632b1ace26e6f0085699db36aa585a8cb0 SHA-256: a7453e404f80b3df692e99a34f28b6b742e8a723579ff2652576a63f50be03f8
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs. One prominent link, however, redirects through 'ttraff.cc', a known malicious redirector, and is presented with text suggesting a 'best chess training app'. This indicates a likely phishing or scam attempt using a link farm to obscure the malicious destination. No scripts were extracted, and the document body was heavily corrupted, but the presence of the malicious redirector is a strong indicator of malicious intent.

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=best+chess+training+app+android
    • http://files.amunetspeaks.com/uploads/1/3/1/4/131406780/706df1a3ec947b.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/bawirunezuzoromif.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/33875386034.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9621/files/38162162504.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/japanese_emoticons_love.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7230/files/h100b_pulse_oximeter.pdf
    • https://cdn.shopify.com/s/files/1/0434/2572/6614/files/zewulanoruwomuzebuwuxel.pdf
    • https://cdn.shopify.com/s/files/1/0434/2959/3245/files/bizebosuminosefepovugup.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/59090829564.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/kogepuwipo.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_off00008712.bin
c8ca857d87f865b01168b0f9744345ca02b4d31b121c5b83f04116fddab52655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8712 5352 bytes
font_01_sfnt_off00009938.bin
732318ce147bd1888527e61392401dbeb974bf1c8fbe3424fe4950542fb1ac0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9938 10136 bytes

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