Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf647de72766041…

MALICIOUS

PDF

61.3 KB Created: 2020-08-08 05:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 851c2d73fe5b1f99d65e7e0646c94377 SHA-1: eab9a2ec5231d82e0128a569b98ff4ac3e7b31f6 SHA-256: 2bf647de72766041bf37d9f75da0779be5bea7d18e58313d859827118d7caf76
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=cracking+coding+interview+python+pdf, which likely leads to a malicious payload or phishing site. The document body, though heavily obfuscated, contains references to technical topics and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of many Shopify links, some confirmed benign, may be part of an SEO poisoning or link farm strategy to increase visibility of the malicious redirector.

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=cracking+coding+interview+python+pdf
    • http://files.emmahannaford.com/uploads/1/3/2/8/132814427/negame.pdf
    • http://files.brouhahagames.com/uploads/1/3/0/8/130874612/lusonejebidoxij.pdf
    • http://files.frederickdeknatel.com/uploads/1/3/2/6/132695454/6605806.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/71436146808.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/98770386240.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6631/files/nexasibubokuwobirifit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/masonry_wall_construction.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/autosar_exp_layered_software_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/envision_math_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/52030151807.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/steam_boiler_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/5385/7433/files/5127497973.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_off0000a885.bin
173a831b96bfc0e378747597e336cabd86ee4e318fefc7ad6cf0ca96168df26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA885 5428 bytes
font_01_sfnt_off0000bb14.bin
ccd3773b7f78e0cc69ac6738dc0d7ed650f8fd2464cd0a8532d66c1eea72382a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB14 14308 bytes

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