Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b91e025f119596…

MALICIOUS

PDF

44.1 KB Created: 2020-07-29 19:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c54b94d67d8a2f876983770648cb62 SHA-1: 27da2017d99155d805bc1bc30192dde9358d81dd SHA-256: b6b91e025f1195966751f6b5b12e7d489d5226905374661f118105168d7febf3
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=air+cooler+project+report+pdf'. Another critical heuristic indicates a PDF link farm, with the primary link pointing to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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=air+cooler+project+report+pdf
    • http://files.aa7design.com/uploads/1/3/1/4/131406736/viwewidasuza.pdf
    • http://files.amazonmycorenewal.org/uploads/1/3/0/9/130969837/3850528d9e.pdf
    • http://files.creativconcepts.studio/uploads/1/3/1/3/131383657/winakekejazobuxipomo.pdf
    • http://files.impactarcheryclovis.com/uploads/1/3/1/4/131483266/9934640.pdf
    • http://files.creativconcepts.studio/uploads/1/3/1/3/131383657/winakekejaz
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/wutevexizowodivodi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/74602654738.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/jixatulujoval.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/saran.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/xeturozavawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/14501237232.pdf
    • https://cdn.shopify.com/s/files/1/0436/1116/0738/files/lesomokukaza.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/xuxomobokotujeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/xabugejawuwamefuzepif.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/85549203881.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/2470655807.pdf
    • https://cdn.shopify.com/s/files/1/0440/0129/6534/files/lilorawajuwezopubinux.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_off0000710e.bin
1f363067ba200bfe440c6b484fd701842d0990b8fe7e08e454acb9e1b3499576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710E 4508 bytes
font_01_sfnt_off0000806b.bin
66769dee17165ae7ead60ffb90fceb40297e1430bd9200729ecde104ea365785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 10360 bytes

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