Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e709288974b566…

MALICIOUS

PDF

44.7 KB Created: 2020-08-17 12:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a71e013a14538f1cf2352f136ab7ce5 SHA-1: 04712e1a9feb3c6c6dc7915d74d0ce4a15ae4d35 SHA-256: 08e709288974b5666340f9e397e155466303b32c042475e46d8ec34b42aad188
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector, suggesting an attempt to disguise malicious links. No scripts were extracted, but the presence of many external links points towards a link farm or phishing attempt.

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=games+car+racing+3d
    • http://files.sgamesandphones.com/uploads/1/3/0/8/130874317/88c1898c.pdf
    • http://files.birichinokids.com.au/uploads/1/3/2/6/132695302/92cd4.pdf
    • http://files.houghathleticboosterclub.org/uploads/1/3/1/0/131070851/bimuvovuzatemogum.pdf
    • http://xupadar.saludpharmacyshop.com/uploads/1/3/1/3/131383483/e49974a0dd.pdf
    • http://files.leanwithluke.co.uk/uploads/1/3/1/4/131437930/tipuzusudizuze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/0294/2872/files/43242765677.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/timoxoliwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/34780415319.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/walmart_20_gauge_shotgun.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/11636843270.pdf
    • https://cdn.shopify.com/s/files/1/0439/6630/0318/files/aircraft_maintenance_manual_a320.pdf
    • https://cdn.shopify.com/s/files/1/0435/9772/5864/files/vunezaditipefizadawesivif.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/forticlient_vpn_setup_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/34211595951.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_off000070da.bin
8a3c3e3554c62cfb8a765071433ed2ed9f5d28a086e6b88e002a859e05aea8c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 5424 bytes
font_01_sfnt_off00008336.bin
bd362c9742d00da1600b8534fd0f2e5151d0fbbcf3471e1821ace1ffc6dad7d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8336 10156 bytes