Malicious PDF — malware analysis report

Static analysis result for SHA-256 d628b9cd8af44205…

MALICIOUS

PDF

39.4 KB Created: 2020-08-23 09:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ada4fbed27897184dbb8fb8f4af903e SHA-1: 46509ebc3deb5982b2501b09b1608241dc889efb SHA-256: d628b9cd8af44205ec13e7857439facbfb345f1b083637a31884eea0fe707d15
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body text and embedded links suggest a lure related to IELTS practice tests, which redirects to the malicious URL 'https://ttraff.ru/pify?keyword=ielts+practice+test+answer+sheet'. No scripts were extracted, but the PDF structure and embedded links are sufficient to determine the malicious intent.

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.ru/pify?keyword=ielts+practice+test+answer+sheet
    • http://files.evergreentrackingdogclub.org/uploads/1/3/0/7/130775429/litekipor_mufusi.pdf
    • http://files.dariadavidov.com/uploads/1/3/0/8/130814055/xepukifusolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8009/7687/files/31976451475.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/levels_of_understanding_frankenstein_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4496/1446/files/juduvevosozimekodubot.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/rogue_lockpicking_guide_3._3._5.pdf
    • https://cdn.shopify.com/s/files/1/0441/1647/6056/files/61476633081.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/pirisaxixopixoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/61969149426.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/online_autocad_file_converter_to.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_off00005d78.bin
2b5c154019a0f68c60a3f72147d98225e1fae12856428eb2b58762bb10f9f310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D78 5052 bytes
font_01_sfnt_off00006ea8.bin
2b876ab5012c80fd3d001b894e6bbf109f2d12df2593985a762d642a258a4f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA8 10500 bytes

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