Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ab8085d9e94f49…

MALICIOUS

PDF

65.3 KB Created: 2020-08-30 18:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e97d956198b11c216f39011a7934457 SHA-1: 655b730f21722044c1f9006e5cd6c9c3ea174297 SHA-256: d8ab8085d9e94f49662c3e4dfe9f0bec3102560bf57ee99e090aa0aadc5ae948
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for a specific PDF. This indicates a likely phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of the malicious URL and the SEO link farm heuristic suggest the document's primary purpose is to redirect users to malicious infrastructure.

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/wix?keyword=adeptus+mechanicus+codex+8th+pdf+vk
    • https://cdn.shopify.com/s/files/1/0429/3427/2163/files/cehv8_certified_ethical_hacker_version_8_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/pulesurabejefotukafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2015/files/rowujiwemijapuduxokez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/51165148173.pdf
    • https://cdn.shopify.com/s/files/1/0443/1645/9164/files/bihar_daroga_mains_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/ruvapufewapabivanijurokig.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9057/files/30411271081.pdf
    • https://cdn.shopify.com/s/files/1/0434/0704/8860/files/58292675294.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0440/3170/5238/files/cast_iron_properties.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6649/files/mimewerepoxevogiw.pdf
    • https://static.usrfiles.com/ugd/5360f8_0be8fa1487a94c1ba362483b55193c83.pdf
    • https://static.usrfiles.com/ugd/b8c837_05380624090343b5bca55777ce2fa750.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/
    • https://cdn.shopify.com/s/files/1/0443/1645/9164/files/bihar_daroga_mains_qu

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a542.bin
f13906fde084beb137c811916a3fc17d8ddd87f407b9c285a15855ec57a7ddd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA542 5524 bytes
font_01_sfnt_off0000b7f1.bin
194803a3f220a7469d35a46d646401f9a44c1cb71e75d9bb53cbb65861e7a004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 16188 bytes
font_02_sfnt_off0000ea03.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 4324 bytes

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