Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d8ebd69868a76c…

MALICIOUS

PDF

43.3 KB Created: 2021-05-16 17:57:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1d8a9cc066d1744798a93630f40a4a8 SHA-1: 423fbe6135dbaf60d6748f0eb6f7f1704ba45f33 SHA-256: 61d8ebd69868a76c0f79111f176397a4e5f0c3c5a45b51fed7e4b104c3616321
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to known malicious redirectors and a large number of links to other PDF files, likely part of a link farm for SEO manipulation. The document body and heuristics indicate a lure for game-related cheats or generators, which is a common tactic for distributing malware. The primary URL directs to a page promising Minecraft hacks, which is a typical social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.xyz/app/479516143/minecraft-windows-10-edition-hacks-game-hack In PDF document text
    • http://www.apocalissedigesucristo.com/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/robux-online_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://www.apocalissedigesucristo.com/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3B 25364 bytes
SHA-256: f0194e7e05bea1ff0c9fd2903919ef0cb7c77fbcfc61f29f1f81047ec96de2a7
font_01_sfnt_off000085cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CF 18696 bytes
SHA-256: 57995c7d2e560419c32609fd78c9e8de7fe6f2ec65952b3fe21507803a80983b

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