Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d383d85e8a703af…

MALICIOUS

PDF

46.1 KB Created: 2020-07-09 02:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dfa430c67f419c1c7750ffa904a7405 SHA-1: cd9adcca1666ae2ff71f53ab5b544c06610af7db SHA-256: 6d383d85e8a703afad3c30bb7ecc8c9ec668fb8b0b42910aa977e1ca96741122
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO spam campaign designed to lead users to malicious sites.

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.cc/wb?keyword=an%20astrologer
    • http://files.quoisdesigns.com/uploads/1/3/1/8/131871720/3861814.pdf
    • http://files.shopdovetail.com/uploads/1/3/1/6/131636746/varufi.pdf
    • http://files.deewiegand.com/uploads/1/3/1/0/131069875/takivokonemafitujufo.pdf
    • http://files.oddlogicbrewing.com/uploads/1/3/2/6/132682681/4135347.pdf
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdf
    • http://files.rejectrobotics.com/uploads/1/3/1/4/131412858/69fb380c026.pdf
    • http://files.saravaughnskincare.com/uploads/1/3/1/8/131857818/refinexibosum.pdf
    • http://files.daughtersofthemayflower.com/uploads/1/3/0/7/130775520/a25bef04.pdf
    • http://files.alfurqaantours.com/uploads/1/3/1/4/131438468/856052.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kuzujodo.files.wordpress.com/2020/06/dedojumuzu.pdf
    • https://vefejavu.files.wordpress.com/2020/07/xumimerodugapepitezer.pdf
    • https://jilabalaku.files.wordpress.com/2020/07/fimate.pdf
    • https://xopaluwefaje.files.wordpress.com/2020/06/vugikitorivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.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_off000077f6.bin
0e4fe23b07635d14f99e9bbc7228bbc294c402a6a270190892201dcdb8868e10
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F6 5072 bytes
font_01_sfnt_off00008956.bin
3cc1bd2b193ad5135a700f824ab0615789173ac7cd5680701de36e0547ef0b35
pdf-font-stream PDF embedded font (sfnt) at offset 0x8956 10168 bytes