Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a540027d4bd2e0…

MALICIOUS

PDF

34.6 KB Created: 2020-08-10 14:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6923c663d87cc816e02257b311fbf0c SHA-1: 8e8c2418f56b22675799e97a836ea4cf50cd1a22 SHA-256: f5a540027d4bd2e02f102bdf5c775417be36d905b9d33faf67908da425ff7a0c
150 Risk Score

Malware Insights

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

This PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicating a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=alter+ego+b1+pdf. The document body is heavily obfuscated and contains numerous embedded URLs, further supporting the attack pattern of redirecting users to potentially harmful content.

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=alter+ego+b1+pdf
    • http://files.grandcanyonschoolpta.org/uploads/1/3/2/6/132681213/vanasuge_zimotulimo.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://files.spawholesaleproducts.com/uploads/1/3/0/9/130968961/xumemagetewetijip.pdf
    • http://files.leedstriathloncentre.co.uk/uploads/1/3/1/4/131406453/6874189.pdf
    • http://files.planoeastbasketball.net/uploads/1/3/1/4/131453615/ziparewow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/pipiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/69993563239.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/jee_mains_b_arch_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/9553899261.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/kexekurenezofebexap.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/43722350256.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/96755215436.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/siralorefifiwezelovug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/bwv_1067.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_off00004aae.bin
22a711f9b6c3e961692fb9a665ec8a046ca1463bc2e17d88e7849ea9f98a27b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAE 5004 bytes
font_01_sfnt_off00005bc4.bin
6255b9f86e02f4e5fc190e22ddadfd20072d1a4ebe6ca0e84d56b81d423fac4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC4 10040 bytes

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