Malicious PDF — malware analysis report

Static analysis result for SHA-256 897e2375580a719f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-03 17:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87ed7dd91ba105beda48b04fe44aa153 SHA-1: cefde00a92a83089c0a696d5640575fd2249c9c4 SHA-256: 897e2375580a719ff464eb0d53e25ac971f791a1793ee8afa12126136b200d38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, including a redirector to 'ttraff.com', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=french+demonstrative+pronouns+exercises+pdf', indicating the lure is a fake exercise PDF. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature.

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.com/pify?keyword=french+demonstrative+pronouns+exercises+pdf
    • http://files.jakegrahamphotography.com/uploads/1/3/1/3/131381003/57b7755a6c10.pdf
    • http://files.tnquarterhorsesales.com.au/uploads/1/3/1/3/131380848/puwumoguza_tavudizupoxu_satozu.pdf
    • http://files.equinoxpartyevents.com/uploads/1/3/0/7/130739264/natina_nibaziselako_mavegexugir_kukosimovas.pdf
    • http://files.tkartdesign.com/uploads/1/3/1/8/131871704/lejuzijevijit.pdf
    • http://files.tesoltime.com/uploads/1/3/1/6/131606348/mefede-sebawalusi-nenesemozided.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/gidozasagizira.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/73363931240.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/durixe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/95802801656.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/vejulabegajegazemopuje.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/verelimu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/derivative_analytics_with_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3363/files/dikazofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2158/3004/files/honda_gcv160_pressure_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3989/9304/files/7501907504.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/55665547608.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ae9.bin
ba2f1895ff014f28b52ec2aaaf33d07bdf8e55329fee88ffa5a5bff6fd3fe2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE9 5444 bytes
font_01_sfnt_off00007d51.bin
a0daf674af66d5481656719e4ceee73d5feea90e715a48c83bec006404c3f1ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D51 11276 bytes

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