Malicious PDF — malware analysis report

Static analysis result for SHA-256 71645a0dbb76f546…

MALICIOUS

PDF

43.8 KB Created: 2020-09-03 18:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 588a9493db3af76f9a2e6e7615874836 SHA-1: ea644a0aed10a55cbefb8820be748b7b8a42b7d9 SHA-256: 71645a0dbb76f546b12d89dbbfaa553d6ed16738a1263139623adb9df32f934a
154 Risk Score

Malware Insights

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

The PDF contains a lure related to 'emulator error android_sdk_root is undefined visual studio' which is designed to trick users into clicking a malicious link. The embedded link directs to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The presence of numerous other PDF links suggests a link farm SEO tactic to improve search engine ranking for malicious content.

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/wix?keyword=emulator+error+android_sdk_root+is+undefined+visual+studio
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/businessman_3_movie_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/12765951210.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/bexiritilozazemumurufa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2198/files/rijutodudafejonuzinino.pdf
    • https://cdn.shopify.com/s/files/1/0441/2624/0920/files/capacidades_fisicas_3_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4130/0380/files/bozezetemomemegedidonenig.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/vugejitutofefebunubotazod.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/fire_sprinkler_design_guide.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_b092840921ee45c893e45006b6c1ad65.pdf
    • https://static.usrfiles.com/ugd/40b9e6_aa977192b5d5468bb2ee81c6bf433885.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6124/files/wogasuzegubeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/tatotonowela.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005efb.bin
657308c3a8560e729e7eacef16af022664fdbc1acbb3f05546a647017ba70de7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFB 5044 bytes
font_01_sfnt_off0000701b.bin
605e4a53df257259f4b0cd58f3c32ea14250d81ab262d61dc9759caf8032e506
pdf-font-stream PDF embedded font (sfnt) at offset 0x701B 10480 bytes
font_02_sfnt_off00009403.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x9403 4324 bytes