Malicious PDF — malware analysis report

Static analysis result for SHA-256 061d77d79804eb78…

MALICIOUS

PDF

41.0 KB Created: 2020-08-09 23:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316e340a9a4925bcba3343742f147923 SHA-1: 42de199bd709a910d4c442df0faf0f837730d0a5 SHA-256: 061d77d79804eb788c85eb15c738ea47ebfcf8720ec99da0dbb6bd2bb8bd5e72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised with a 'day care application' keyword, aiming to lure users to a potentially harmful site. The presence of a link farm further suggests malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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=day+care+application+pdf
    • http://files.cottagesinthecotswolds.com/uploads/1/3/1/8/131856195/kusikodifu_fixikuzexi.pdf
    • http://tasezoto.outwesttechs.com/uploads/1/3/2/3/132303382/devupevojisowij.pdf
    • http://files.hosthomescowichan.ca/uploads/1/3/0/7/130775490/e3f6bd3d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/96402754503.pdf
    • https://cdn.shopify.com/s/files/1/0441/3492/4440/files/11106364357.pdf
    • https://cdn.shopify.com/s/files/1/0448/4952/8989/files/30123467997.pdf
    • https://cdn.shopify.com/s/files/1/0440/6083/6005/files/bajowodo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/32416080617.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/mario_run_apk.pdf
    • https://cdn.shopify.com/s/files/1/0438/2418/5506/files/64013154676.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1766/files/fuvosiwoxawosanunanerib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/golikito.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/6103932364.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_off000063fb.bin
8353834195cbf66e58fc96a70c7356e2bf3e69cfa3182a40567994645e9571e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x63FB 5072 bytes
font_01_sfnt_off0000755b.bin
905bdc40c6e9206b48d658191cf3483012abf35b5943276a9079f02089e56ced
pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 9952 bytes