Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b33ca2ee8e2d97…

MALICIOUS

PDF

44.7 KB Created: 2020-08-09 16:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b32d637d20406d05051d22c054ac1b0d SHA-1: b163b585963bd22ca2d32cb24f5ad47a096d3d4a SHA-256: 19b33ca2ee8e2d974d1a7466587336c01133913e3fda49ccea1419f526fc6b54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cahier de journal primaire pdf' and includes URLs that appear to be part of a link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness.

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=cahier+de+journal+primaire+pdf
    • http://files.empoweredhospitality.com/uploads/1/3/1/4/131437862/faxoxotaf.pdf
    • http://levexudu.prairieparadisefarms.com/uploads/1/3/2/7/132710703/7114647.pdf
    • http://files.pacificcountycovid19.com/uploads/1/3/1/3/131379803/napimavuwolobidexo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/berapefagafowaxaletukida.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/fogepesazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/xapulo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/pomedemipugimunup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/outlook_allergan_webmail.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/vimila.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/53745413053.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/vice_city_font.pdf
    • https://cdn.shopify.com/s/files/1/0433/6720/2974/files/joboxosatunanikapote.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065bd.bin
7835be6dadb03d44bbe84ede4e2cef9877c62028828b6e7b500cc09ad1de8e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x65BD 5084 bytes
font_01_sfnt_off000076db.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 1800 bytes
font_02_sfnt_off00007f68.bin
4c26a1e88071b621f3b21a241b51e4000f7c32ef23a921728900074904befce0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F68 11684 bytes