Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ace594a0900beb…

MALICIOUS

PDF

42.6 KB Created: 2020-08-01 18:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93331db922aa00d70e1826a9996f076 SHA-1: 425ea4b187ffb1bbd533ef3e0fdee07265ed5859 SHA-256: 98ace594a0900beb02bac54f33895770a22dafbe37b1a3d75df3999c7001873c
154 Risk Score

Malware Insights

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

The PDF document contains a deceptive title and numerous embedded links, including one pointing to a known malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=stop+nox+from+installing+random+apps, which likely serves as a lure to a further malicious destination. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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/pify?keyword=stop+nox+from+installing+random+apps
    • http://files.heartlandjungians.org/uploads/1/3/0/7/130776841/ziniruper.pdf
    • http://files.hamiltonandhill.com/uploads/1/3/1/4/131454221/sofuwesu_texuxuvovupeteb_motiv.pdf
    • http://files.zazaboocosmetics.com/uploads/1/3/1/0/131070579/mefosexemof-zuridetixu-piwinipetis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/jariragolerumote.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/36427900441.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/92557796115.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/58544703749.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/62171897981.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/boxosunipipogurova.pdf
    • https://cdn.shopify.com/s/files/1/0432/3413/2131/files/39010765853.pdf
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/nuzabupisuxitidirave.pdf
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/59225136050.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/vewenilefap.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_off0000602f.bin
3ccc2678606c0b780838f438a3890e7e9b9575b320ff9b2f02cc6dfdb23ef50c
pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 5532 bytes
font_01_sfnt_off000072f0.bin
682f55c23c5e3c2ce2a44cb62806da15a10d985433d861bec0da993cf6068ae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F0 13204 bytes