Malicious PDF — malware analysis report

Static analysis result for SHA-256 8651f37f79833426…

MALICIOUS

PDF

40.1 KB Created: 2020-08-21 23:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 837a3b61b46c6208dbafed893ed4bd03 SHA-1: d91fa4ccb6569a31a3e03628992c8c330eccb50f SHA-256: 8651f37f798334260f92a8f34c9b8c90991a6cf5e25ec5fbc7c0879967ac179b
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.com/pify?keyword=admiralty+chart+correction+guide', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. No scripts were extracted, but the presence of a malicious redirector and a link farm indicates an attempt to lead users to harmful 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://ttraff.com/pify?keyword=admiralty+chart+correction+guide
    • http://files.chinesebiblewiki.com/uploads/1/3/2/6/132680855/175096.pdf
    • http://files.thereptilebarn.com/uploads/1/3/0/8/130813489/kezav.pdf
    • http://files.elizabethkotite.com/uploads/1/3/1/8/131856173/fegewinaripiw.pdf
    • http://files.elginparkathletics.com/uploads/1/3/1/4/131406413/xikudenaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/11825578819.pdf
    • https://cdn.shopify.com/s/files/1/0437/7408/3233/files/megafakevok.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/39484718340.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2591/files/cara_membuat_bookmark_di_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/34609881053.pdf
    • https://cdn.shopify.com/s/files/1/0429/1752/7715/files/nogapexuvekefisoluvugigib.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/veledofo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/xovuxorot.pdf
    • https://cdn.shopify.com/s/files/1/0434/2916/7270/files/79043705454.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_off0000605a.bin
a0b53fc0d3b2216cb96844de88a0b3fc0fa5b1b292c1a3938c427e61d838c497
pdf-font-stream PDF embedded font (sfnt) at offset 0x605A 5264 bytes
font_01_sfnt_off00007217.bin
758a382266456af0e6bf2236adac7e9936f83a59c2092265d1a9d6a38b055e25
pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 9788 bytes