Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdecd23cff75872…

MALICIOUS

PDF

41.4 KB Created: 2020-08-10 05:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 405b57cf007323c35f3d919fefe911ae SHA-1: c74484b8e054988d04d95fce67b578411183d2fb SHA-256: 6bdecd23cff758723bee59dc0a247b03d51e41c4e1d7160c3696c25b8b2a74ca
194 Risk Score

Malware Insights

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

The PDF contains a lure for a book download, which upon clicking redirects to a malicious URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the embedded URL confirm this malicious redirection. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests a potential pretext for further compromise, although no specific remote support tool was explicitly mentioned in the document body.

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=the+babysitters+club+book+1+pdf
    • http://finoj.lifetimeepoxyfloors.com/uploads/1/3/1/4/131452821/80194868.pdf
    • http://files.mrsklauesclass.com/uploads/1/3/1/1/131164358/lujiwaretofexag.pdf
    • http://files.pragueguidebooks.com/uploads/1/3/2/6/132681632/4e65907699c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/53825369751.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/today_ap_sakshi_news_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/bawotolinadonuwanaduxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8837/files/22240067419.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/sozesusipejoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/giboxig.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2315/files/95383383191.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/gejilukepezoziju.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/wunekijinipifogudodav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/56242059593.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6815/files/ges_mathematics_syllabus_for_jhs.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/39352553599.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_off0000631d.bin
ee8fb13cc9555463d62d5b24513dc838e476972f8027d57e6bb0d880c3ba4141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631D 5548 bytes
font_01_sfnt_off000075fb.bin
f611d5c42bd9bbf0a3aeb63055c8de847a2d50c548115300d6672f02a188342a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 10148 bytes

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