Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e99858b7cd472d…

MALICIOUS

PDF

36.8 KB Created: 2020-09-18 06:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1934e7252b26993ec4bd58b8f21e9af7 SHA-1: f9430302e86d3a241d8e2857bbf79ac3ba0da11e SHA-256: 84e99858b7cd472da168b690697be23b380c77dfa6fb4b17bdbc650bbb406acb
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, one of which, https://ttraff.club/wix?keyword=an+aquatic+apocalypse+solutions+vocabulary+worksheet+answers, is a known malicious redirector. The document body is heavily obfuscated but appears to contain metadata related to the worksheet title and the authoring application, suggesting a lure document. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=an+aquatic+apocalypse+solutions+vocabulary+worksheet+answers
    • http://tatijunus.fishbowllabs.com/uploads/1/3/1/6/131607662/52896.pdf
    • http://zuramaxa.richlombino.com/uploads/1/3/1/4/131407406/2723245.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/77695453114.pdf
    • https://cdn.shopify.com/s/files/1/0439/1718/1083/files/xifuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/rorulanirenemubukidifizak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/fakuniruroramelurak.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/home_security_risk_assessment_template.pdf
    • https://cdn.shopify.com/s/files/1/0463/2890/5889/files/85309231440.pdf
    • https://5587f5d3-e6f0-4f11-9ceb-61caea442284.filesusr.com/ugd/ceb2e8_a623486622694dcb82869effc5f2e461.pdf?index=true
    • https://59527e33-29b5-44a2-b710-c7938d39efa9.filesusr.com/ugd/e2b09b_7e076ee158e942e7b68bf64243970ad7.pdf?index=true
    • https://bac88388-b9f9-424d-aeac-4de7fca36765.filesusr.com/ugd/70e7d4_faef314ddc37457b829be2be672754c7.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005097.bin
41123375ddf031c2921d06e3b1bcc88e8cf6f46094ae4f9679b412f3a28631d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5097 5592 bytes
font_01_sfnt_off000063b3.bin
dbfb3fe1c348d0511433b0fd531cb0d22d1330a25e807e260ed8a3f182538f12
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B3 10140 bytes