Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f35fd435dd136a…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 20:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2f57256c29e0549c9e6e4cb17a4b5ad5 SHA-1: 83f2b88cf3a6871703b8e6e4041f7bb3e7a7b230 SHA-256: 40f35fd435dd136a6dab078ae6e6154a5ab357549752a40131255ea58a2bbe06
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on them by promising free in-game currency or hacks. The primary link directs to a site that appears to be a generator or game hack, and many other links point to PDFs hosted on a known SEO link farm. This suggests a phishing or scam campaign aimed at driving traffic to potentially malicious or ad-heavy sites.

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/406889139/how-to-get-free-spins-in-coin-master-2021-game-hack In PDF document text
    • http://apx-centre.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/40-free-spins-coin-master_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_off00004be0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE0 26256 bytes
SHA-256: 3f8770593f9eba52ef444af7033b36a2cdec73137600e08ba6954c95bb2476f1
font_01_sfnt_off00008753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8753 18452 bytes
SHA-256: 614b442f464a30c8e1247073dd83761b8901fda729b002daf0f1775ab60cf60b

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