Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8335e963dd66e65…

MALICIOUS

PDF

39.2 KB Created: 2020-09-12 11:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4054e970d799a1cef3569ca31528ed SHA-1: e4856592bc765264f20f5acfc60b285a5860c1f5 SHA-256: b8335e963dd66e6582ce9aa9f2995216c556587cdde7429fbfc4108fdb1e995f
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains this same URL and also references 'living and nonliving things free printable worksheets', indicating a lure. The PDF also contains a mass external link farm heuristic, with many links pointing to Shopify domains, but the primary malicious indicator is the ttraff.club redirector.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=living+and+nonliving+things+free+printable+worksheets
    • http://files.lighterthanairky.com/uploads/1/3/1/1/131163867/menunepepesowivagu.pdf
    • http://files.pimpernelwharf.co.uk/uploads/1/3/1/4/131453250/gawavujufek-nufabol-xarin-xusavivok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5126/0823/files/42248471995.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/esmolol_bula.pdf
    • https://cdn.shopify.com/s/files/1/0437/0114/1657/files/advantages_of_bounded_rationality.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/jegazoro.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/voridowaxerekigesutuset.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9462/files/allied_2016_dual_audio_movie.pdf
    • https://cdn.shopify.com/s/files/1/0429/3640/2079/files/aplikasi_battery_calibration_apk.pdf
    • https://static.usrfiles.com/ugd/3b47cb_d65c26b3ed0246369ddfb4b6d060be48.pdf
    • https://static.usrfiles.com/ugd/b8c837_625f1e9486dd47de80e94b4c554aced1.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_off00005705.bin
d877919043569f890f66dbaf3e35975dc1a8a065c899d0c45edd12f57956e0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 5600 bytes
font_01_sfnt_off00006a22.bin
3b9e3f8b799b34824bd0626dbd265a1b4c8fdcac0fbfdfd75858a652fb3ad2e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 10880 bytes

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