Malicious PDF — malware analysis report

Static analysis result for SHA-256 df993e1971a2466b…

MALICIOUS

PDF

42.5 KB Created: 2020-06-07 11:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f425a49fe5678d22b67a3e08bcefd522 SHA-1: af544ac275ea4712f940fbb35245e587ea99bf7f SHA-256: df993e1971a2466b21e134717a788ebfa3854f7a9f2d017a0de5bb7014967f88
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also assigned a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to domains structured for SEO spam or link farming, suggesting a lure to potentially malicious or deceptive content. The primary intent appears to be directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8780876-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8780876-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/wp3?keyword=tn+land+guideline+value#tn+land+guideline+value
    • http://mta-sts.pamelajohnson.net/uploads/1/3/0/7/130739362/wemamefowexiw.pdf
    • http://weteamgolf.org/uploads/1/3/0/7/130738913/7173161.pdf
    • http://iamvirginalaska.com/uploads/1/3/1/0/131070165/wadixami.pdf
    • http://thedoylehotel.com/uploads/1/3/0/7/130775427/759712.pdf
    • http://ruthcoppard.co.nz/uploads/1/3/0/6/130639982/950873c99e.pdf
    • http://supportingfriend.online/uploads/1/3/0/6/130622009/9794899.pdf
    • http://darenn.com/uploads/1/3/0/8/130874496/nojujukokipukosowi.pdf
    • http://doctorofpelvichealthandrehabilitationvero.com/uploads/1/3/0/9/130970012/6a3bf5d.pdf
    • http://sunhightsllc.com/uploads/1/3/1/4/131437160/wuwodoserumulaju.pdf
    • http://drivingbodymindmystics.com/uploads/1/3/0/2/130272319/3638103.pdf
    • http://mta-sts.cahayatimur.net/uploads/1/3/0/4/130436079/391769.pdf
    • http://lenorebeeson.com/uploads/1/3/1/4/131452826/2062173.pdf
    • http://myrealestaterx.com/uploads/1/3/2/3/132302766/7428023.pdf
    • https://jupukefef.files.wordpress.com/2020/06/nadogikegiwuwej.pdf
    • https://xinuzipoxelu.files.wordpress.com/2020/06/47690762183.pdf
    • https://zaruzov.files.wordpress.com/2020/06/36434177189.pdf
    • https://lojukuse.files.wordpress.com/2020/06/mufexe.pdf
    • https://wejujixagaz.files.wordpress.com/2020/06/vuwam.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8c.bin
af32b8ae766d717e16698d7e43df9160f60bd5fa2e9ef6ecdefe8fc08e84be5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 8880 bytes
font_01_sfnt_off0000787d.bin
eb4ee0905587c18ebea90e68d2221891f70cc6570ed3931e3094a754cb6147d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787D 10976 bytes

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