Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c0bbcc174c6a73…

MALICIOUS

PDF

53.6 KB Created: 2020-08-08 02:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17b6ab64cdf40afab574f4b72849c249 SHA-1: d890fbdba96ce70340a6c20d001fbd8a4b71c982 SHA-256: f2c0bbcc174c6a73530c0b901342999797346f6b95d8bc74d4dc631af98c70b6
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=buffer+solution+project+pdf, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=buffer+solution+project+pdf
    • http://files.juliroseflower.com/uploads/1/3/1/4/131452817/8208055.pdf
    • http://files.2girlsandabook.com/uploads/1/3/1/8/131857315/rezutiruboxu.pdf
    • http://nipozu.ohiostoragestructures.com/uploads/1/3/1/4/131482853/7122576.pdf
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/41175347537.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/92516516631.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/33318755951.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/zevasowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/59179789983.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/bolawirezasoxozisafow.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/wujajabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/sogikorovobiromiral.pdf
    • https://cdn.shopify.com/s/files/1/0438/2477/5330/files/76622579859.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/logopazunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/54496664769.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072af.bin
3941fa93ae4337515a7466aba1cb2c530b07b73efbf0e188de7c2af34390f839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AF 4944 bytes
font_01_sfnt_off00008396.bin
5bafdeab54782ef73fbdfc633af30989c0f21509a6f35dd1d2c7b511f3ef8fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8396 9952 bytes
font_02_sfnt_off0000a5ce.bin
7218744734f6461795c92999d79738413e64b3cf861b004d9428dd7ecbb9ceeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5CE 16196 bytes
font_03_sfnt_off0000bb06.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB06 4324 bytes

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