Malicious PDF — malware analysis report

Static analysis result for SHA-256 8652cf572e218789…

MALICIOUS

PDF

49.5 KB Created: 2020-07-23 05:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9124a0274483b58e1a42c1c74a9cca67 SHA-1: b4cd7738ce2184c63434b008b1cca7ca13f75eac SHA-256: 8652cf572e2187894a45db937ecd43b41d315c9b467d01bd08599a46ea327171
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the document's structure and embedded URLs suggest an attempt to lead users to potentially harmful content, likely for SEO poisoning or phishing purposes.

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/wb?keyword=kalender%202019%20zum%20ausdrucken%20ohne%20pdf
    • http://files.themerchantsguildstore.com/uploads/1/3/0/7/130738918/bujakitujexilokosodu.pdf
    • http://files.coffeetacoffee.com/uploads/1/3/0/9/130969065/2041573.pdf
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdf
    • http://files.craniosacralsydney.com.au/uploads/1/3/0/7/130739837/dekifirimozim_piturilub_jegow_goxoxaxuzu.pdf
    • http://files.difficultjet.org/uploads/1/3/2/7/132740375/puzilazunup-gulesirosolene-bebatib-wusebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/retujadajelexebirideju.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/8615476085.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/74720159251.pdf
    • https://vipewudubeg.files.wordpress.com/2020/07/wofenovivokelab.pdf
    • https://morureni.files.wordpress.com/2020/07/tozufawoxejexu.pdf
    • https://bekururumema.files.wordpress.com/2020/07/80651539087.pdf
    • https://lirapirabemo.files.wordpress.com/2020/07/62662335202.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/21161907075.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/zifaragas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/winipuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/22580370354.pdf
    • https://cdn.shopify.com/s/files/1/0440/4438/6454/files/xolegesuvekeku.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/90816738803.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/zelag.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_off00007dd4.bin
24793daa3950d01ec4cf5fbc4d35b6b34e4993ade36bd245e39f09972879b5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD4 5712 bytes
font_01_sfnt_off0000911b.bin
f79205445eeeda4f875b9c9890b011ce520d9c747e1695b39fe67e35d03de173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x911B 11736 bytes

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