Malicious PDF — malware analysis report

Static analysis result for SHA-256 914ff3d6bcdffc8b…

MALICIOUS

PDF

45.9 KB Created: 2020-10-29 14:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c07fda1d0ff2617809b82512b2acc7c SHA-1: 12b0c9eeaf6ae1b742e48777df6a64003d7da886 SHA-256: 914ff3d6bcdffc8b4b317f35e81d9e4bab10ddd4907951afb640414d0f08470a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised within content that appears to be about a bunk bed. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the embedded URL strongly indicate a phishing or scam attempt. Although no scripts were extracted, the PDF structure itself facilitates the redirection, aligning with common techniques for delivering malicious content.

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://cctraff.ru/strik?keyword=king+size+bunk+bed+with+desk
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f9a33db5a265.pdf
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f8ce4c401a05.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5f995fd827f0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3b1eefb-0818-43f6-b336-8c924693bb22/22721044293.pdf
    • https://uploads.strikinglycdn.com/files/2d95c981-3d57-4657-890f-4a856dcfccd6/4602027830.pdf
    • https://uploads.strikinglycdn.com/files/f6ccb100-3c58-4c43-84de-53392d9a55f6/ramugepuwogil.pdf
    • https://s3.amazonaws.com/wupiwupiwot/cch_tch_file_bng_nitro.pdf
    • https://cdn.shopify.com/s/files/1/0499/2991/2488/files/guvovatebo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/sheep_reaction_time.pdf
    • https://s3.amazonaws.com/tixedujegibex/34861255024.pdf
    • https://cdn.shopify.com/s/files/1/0502/1925/3939/files/zaxejevi.pdf
    • https://uploads.strikinglycdn.com/files/09d40ada-faf1-4c4e-9772-cafc2e488d27/xatotiletupef.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_off0000742a.bin
e3bf1981e341a30b4c4dd0c9c99743012e7549615c827182d4d8ec58ed3bb2b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x742A 5064 bytes
font_01_sfnt_off00008586.bin
d78d11fbf42e8273a6993bd0e321a5ce4fd7a35cc8fe5a19c6265f1674fd8ec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 11420 bytes