Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bb975e41994655…

MALICIOUS

PDF

44.9 KB Created: 2020-08-14 18:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9249fd08f4909f701bf9ce73d0f7729 SHA-1: 21d8acbc5a689c86db85595d59d2a66b3e3b1fb9 SHA-256: 02bb975e41994655b9fd2032c4b8cc057eb82d0dfa7e325c97e42bdff0a41196
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, classifying it as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=security+consultant+business+plan+template', is identified as a malicious redirector. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=security+consultant+business+plan+template
    • http://files.lindalgraham.com/uploads/1/3/1/4/131455283/7d86161771d526.pdf
    • http://jutisin.kienmassage.com/uploads/1/3/1/3/131398444/nixudove_jadewulizafo_dorekagejeruwa_donokofu.pdf
    • http://konevinis.isabeltamouro.com/uploads/1/3/1/6/131606346/3ed2c4f9c4b.pdf
    • http://files.vintagesmallenginefixer.com/uploads/1/3/1/6/131636678/8541767.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/95104259301.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4454/files/83984647075.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/61554717564.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/kaxotexisele.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/kiganidaxavebesoximi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/youtube_playlist_duration.pdf
    • https://cdn.shopify.com/s/files/1/0438/5266/0901/files/rokowowovukabigadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/centos_vs_redhat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/3414172933.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_off00007168.bin
73d0ff0c32271b0762c33780f5dc3dc58f6de55b782d8ceee576899ea4ce5b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7168 5424 bytes
font_01_sfnt_off000083c0.bin
e8a1d4f545b94908f6d759b0ac37d802ddcd8a8e6d569edfa3b38e6bf8201c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C0 10328 bytes

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