Malicious PDF — malware analysis report

Static analysis result for SHA-256 736ef1bd912d4f6c…

MALICIOUS

PDF

42.0 KB Created: 2021-05-19 13:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ef195a4578216fc009dd51432329bfa SHA-1: 5f757badee72c1ae668d44920730316013c87a41 SHA-256: 736ef1bd912d4f6c2fb3c3967865406f565080ecc6aa26588a3ce04ffd700095
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, including a known malicious redirector, under the guise of offering game hacks and free currency. The document body and heuristics indicate a lure for potentially unwanted or malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to drive users to malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/free-robux-hack-generator-game-hack In PDF document text
    • http://76remont-kvartir.ru/images/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/wurst-18_GM479516143.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-monster_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-free-spins-and-coins-for-today_GM406889139.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_003_off0000477d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x477D 24996 bytes
SHA-256: 7d1847fec98d35a612cde82abafc658381e274b145aff28e40789c8dbc014261
font_01_sfnt_off00008130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8130 18516 bytes
SHA-256: ac45002ee2c78c55a094f6344a5e95abe10f4ed7f4298fc77d5376065a98214b

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