Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe62a8892ba1206…

MALICIOUS

PDF

40.2 KB Created: 2020-08-16 15:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f456e4690a526d80a5fffe078ab5bfd SHA-1: 26ea75d0b839d470b70a7f65c252f280e1ecbf19 SHA-256: 5fe62a8892ba120658896bcc89d966c94a0d28d957045534ef6922fca0bbc20a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, with one identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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=12+gauge+aluminum+sheet+metal
    • http://files.mmzurita.com/uploads/1/3/0/9/130969847/2056901.pdf
    • http://files.nikkipinkwriter.com/uploads/1/3/0/7/130775635/davawagi.pdf
    • http://files.lulabellsconfections.com/uploads/1/3/1/1/131164431/renitinobuti.pdf
    • http://files.elizajoycesmith.com/uploads/1/3/1/6/131607075/2560895.pdf
    • http://files.dscollegeconsulting.com/uploads/1/3/0/9/130969939/sowobog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/66969945164.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/betaina_literatura.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/josej.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/vijikuwatigeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/41431987119.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/89293986188.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/bosch_gws_6_100_spare_parts_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/memowupet.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_off0000607a.bin
00fc62b2df9995867e735f012a0f28267bec8bc7df968291a5e72000682ee14c
pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 5092 bytes
font_01_sfnt_off000071a3.bin
c53dee91cf7dfe16f1c034aa1556bf21ae15d57618f02d51c3676457a0b2381e
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A3 10168 bytes