Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b134a5cf3dbc319…

MALICIOUS

PDF

42.1 KB Created: 2020-09-18 08:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 458927639aa8a0af9605ca6f644cecff SHA-1: 9e3af3933afe1f3b1a17904430b47358aaa4f2be SHA-256: 0b134a5cf3dbc319e03b21443187d84fb0abc82871759f3edc498d2159a95c68
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The document body contains numerous URLs that appear to be part of a link farm, suggesting an attempt to distribute malware or redirect users to malicious sites. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

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.club/pify?keyword=zombie+tsunami+apk+mob
    • http://pazaso.morleysstoves.com/uploads/1/3/0/7/130776299/ripokopin.pdf
    • http://xorupujon.richardsonsafedriving.com/uploads/1/3/1/3/131383309/ce745.pdf
    • http://bazafu.highlevelstore.com/uploads/1/3/1/4/131438379/6135764.pdf
    • http://sovulopik.linwoodheightsaz.org/uploads/1/3/1/3/131380623/2449715.pdf
    • http://files.mikkiscreations.shop/uploads/1/3/1/4/131453053/lazopuwuwokes_vuxewadejene_xizumox.pdf
    • http://files.jazzybugsdance.com/uploads/1/3/1/3/131398221/1239416.pdf
    • http://jadikowo.lincolnbrady.com/uploads/1/3/1/8/131856080/4882607.pdf
    • http://files.godsvineyardchurch-birmingham.org/uploads/1/3/2/7/132740485/nudewob.pdf
    • http://kisuko.way2wear.com/uploads/1/3/0/7/130776225/mupijux-sopalafuroga.pdf
    • http://files.janealbin.com/uploads/1/3/0/9/130969740/zozisezaxuxu-lanaz.pdf
    • http://files.ronrash.com/uploads/1/3/1/4/131437725/ba65757e2e18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b991fe70-645b-456e-9494-a877e634d717.filesusr.com/ugd/1e52da_c48ddd1b036142679ef04e3d27cbbc43.pdf?index=true
    • https://e8b5e112-c795-43e6-b284-ccf08a872795.filesusr.com/ugd/fef806_e0c105e5f5fc456c8c7c5cbd3d0f7bba.pdf?index=true
    • 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_off0000663f.bin
24efcaae0696d103163e31824d6d21968b987cf425830aa4d389dc3beb3901df
pdf-font-stream PDF embedded font (sfnt) at offset 0x663F 5000 bytes
font_01_sfnt_off0000772f.bin
13d18c78e69ac865eb7419d8121ee65817356327e1f5df149ea3d12d9f28c398
pdf-font-stream PDF embedded font (sfnt) at offset 0x772F 10932 bytes