Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d5eb69b7f0c4d9…

MALICIOUS

PDF

44.3 KB Created: 2020-08-19 13:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b26459363ef8f3e23173e2b70c00ad SHA-1: c0ba514c7bd883d11d993976655405575c187b8a SHA-256: 80d5eb69b7f0c4d9e64df7638ceecaa59c4c945d2499f2bb8a8913bc096738e0
150 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 of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic indicates a direct link to a known malicious redirector, ttraff.ru, which is used to deliver the payload. The document body, though heavily corrupted, contains text related to 'Advanced oxford dictionary apk' and the malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=advanced+oxford+dictionary+apk
    • http://files.charlieinit.com/uploads/1/3/1/6/131606289/f0fd244.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/bezier_surface.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/bopirutejiritakot.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/oreo_live_tv_apk_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1979/files/alcoro_em_portugus.pdf
    • https://cdn.shopify.com/s/files/1/0437/0238/6856/files/linunilawuvuwojewig.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/doxewobotopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/spread_shotgun_wing_t_offense_playbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/3703/8491/files/balle_balle_song_ming.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/66425009829.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b21.bin
306b1a036e4999b9cc66b9b7dab72dff37b47daf3a1d78a74a7100c11c588cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B21 5012 bytes
font_01_sfnt_off00006c45.bin
092b1ed3247ff46fa43376399978e89112b61e57034f4e1b957cc09f982d4e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C45 13060 bytes
font_02_sfnt_off0000966a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x966A 4324 bytes

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