Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3a6dabb4a6c8d2…

MALICIOUS

PDF

33.6 KB Created: 2020-08-14 06:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50ed9e249a97696a496f9bcf3b0bad55 SHA-1: 72cfeb61dfce9ec9bceb8eea919f0ac3a8664e33 SHA-256: ff3a6dabb4a6c8d28d2a27bd37e8714c0eb84d1c1ba238bb236e608d36e9bcd0
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=gradient+of+a+curve+worksheet, suggesting a lure to a malicious site. The presence of numerous links to Shopify-hosted PDFs indicates a link farm technique, likely for SEO poisoning or to obscure the final malicious destination.

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=gradient+of+a+curve+worksheet
    • http://files.kidsclique.net/uploads/1/3/0/8/130814308/nemexafirevenadoror.pdf
    • http://wubew.susmanosextendidasmexico.com/uploads/1/3/1/0/131070374/puferotufifu.pdf
    • http://files.omfzambia.com/uploads/1/3/1/4/131409037/827504.pdf
    • http://zefepen.karenpmorrison.com/uploads/1/3/1/4/131452938/nixetudikufoxew.pdf
    • http://files.apbartels.com/uploads/1/3/0/7/130775675/8909467.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/nanup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/last_will_and_testament_template_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30072581460.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/zirukolivuxonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/98527497521.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/5839082108.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/verbeelding_bouwbesluit_2020_brandveiligheid.pdf
    • https://cdn.shopify.com/s/files/1/0438/9126/1595/files/41666748429.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://cdn.shopify.com/s/files/1/0436/8157/9161/files/ffmpeg_mkv_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/autoimmune_hepatitis_diet.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_off0000469c.bin
1952759257e00240e2749aad132dffee4b9d8b9a7c99e42fd8198973823223a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x469C 5324 bytes
font_01_sfnt_off000058cd.bin
9b1677d21b5a6d60deea6298e9a0801ab231155dbda3bc35825713e5fa32ec80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58CD 9600 bytes

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