Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c5700031c29b5c…

MALICIOUS

PDF

39.2 KB Created: 2020-08-19 16:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bff550023f5c1aa569e5b76b5af7fbd4 SHA-1: 5e5a1ea5246d532192921c9e5ccafc20cf883304 SHA-256: c9c5700031c29b5cb6b231ebffbcd38d1908f937a524c636619875c40dfdd15d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is likely a PDF link farm, designed to manipulate search engine results or redirect users to malicious content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=game+brother+in+arms+java+320x240.

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=game+brother+in+arms+java+320x240
    • http://kobipuka.architecture-walks-and-talks.net/uploads/1/3/1/1/131164250/04b335ee6f376a.pdf
    • http://files.irisbenjamina.com/uploads/1/3/1/1/131163643/6559067.pdf
    • https://cdn.shopify.com/s/files/1/0428/3626/3078/files/blackberry_q10_sqn100-_3_firmware.pdf
    • https://cdn.shopify.com/s/files/1/0437/9721/7440/files/70178288534.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/nopunaxuwixurore.pdf
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/1109535161.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/17094718981.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/poguxukenenepomimedaluvu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/bahria_orchard_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/weather_report_chennai_last_15_days.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8176/files/34093796286.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/63983403979.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.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_off000058ff.bin
868aeb3ca694bd360b37962608039da3ba1946c2728ca9c331d0578641cc3f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FF 5792 bytes
font_01_sfnt_off00006cae.bin
6d059d1987a682a1bd7f481275d116de32b22e805c5ac106af5ccba4125a93e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 10440 bytes

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