Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4180552b826c9e4…

MALICIOUS

PDF

42.8 KB Created: 2021-05-18 03:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cc16849a5ae964874caee3776ecdefa9 SHA-1: 193a30c3ddab31bae350e7476ee3ef1c7db07389 SHA-256: e4180552b826c9e4d8799cd347c7d40119beb2443502bfdc8f6c6e89dbcb670e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one that redirects to a 'game hack' lure, indicating a phishing or scam attempt. The presence of multiple links to external PDF files, many with SEO-like slugs, suggests a link farm designed to drive traffic to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to harmful websites.

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/how-to-get-robux-without-human-verification-game-hack In PDF document text
    • http://ltmphoto.com/images/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://ltmphoto.com/images/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/114-hacks_GM479516143.pdfIn PDF document text
    • http://ltmphoto.com/images/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://ltmphoto.com/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://ltmphoto.com/images/how-to-get-infinite-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_003_off00004937.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4937 24792 bytes
SHA-256: 3ba5613860277549c52d80e5043ca106e5bc7b1899fa9f77cbc44e7492d44373
font_01_sfnt_off0000822c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822C 19224 bytes
SHA-256: 827742436377dbec2faf93c76f10b641fa3172d3ca4fb107ae0768851af7cb2a