Malicious PDF — malware analysis report

Static analysis result for SHA-256 76572c816cefb32c…

MALICIOUS

PDF

44.4 KB Created: 2021-05-14 00:46:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5932f489ea29aa62c9ced4047efe087f SHA-1: a779ea0dfdb60b5a4b6e28f273795a68186533d8 SHA-256: 76572c816cefb32cb90f6287ae655787327bb3b81f868f4f834bdeee4aab6920
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and a link farm, disguised as game hacks and generators. The document body and embedded links suggest a lure to trick users into visiting potentially malicious websites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/freespinandcoin-blogspot-com-game-hack In PDF document text
    • http://centr-expert.su/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47ED 24584 bytes
SHA-256: 442d8989adeaa938ec15639553742fc7004a46015b6f71c5444c9f3fd2cfe08c
font_01_sfnt_off00007f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F38 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8923 18900 bytes
SHA-256: 0bd07ae10b4135fe6bf307be1017512cce62593240b8ef3e9f0b310f171768fe

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