Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6227b2d2742738f…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 11:57:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b4ed71aad43e494590b73cb4a72886c0 SHA-1: 568104b370c8207b90f03b5bfca35cf4d90c0a15 SHA-256: f6227b2d2742738f00a864c2b102c26f002a971be8372a1757442431b3abd98d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector infrastructure at `netcdn.online`, disguised as a 'game hack' generator. The document body and heuristics indicate a lure for free game items or hacks, a common social engineering tactic. The presence of many SEO-optimized PDF links suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/479516143/minecraft-hacked-client-game-hack In PDF document text
    • https://www.insol-europe.org/uploads/files/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-points_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-zone-free-robux_GM431946152.pdfIn 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_004_off000053b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B3 28984 bytes
SHA-256: f7fa34d5dab625bbed156b80a49aac5d7903205250391edf6262d3e51edcf14a
font_01_sfnt_off0000951a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x951A 17988 bytes
SHA-256: 60084e38a3b13cc374d8b54708ec2a3852040562095209170bda5240b53bf335