Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdc5b80c630b038…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 11:15:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 15fd0bd64dd96793cecf5c10338fa412 SHA-1: abec38e8fbd52e2b948dbefe6100890ca256d856 SHA-256: 1fdc5b80c630b0382be96b1ffd20b0b7c4795ad06f0ac9ec26e4990417147215
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/free-minecraft-printables-game-hack In PDF document text
    • https://www.similar.com.tw/upload/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/hack-roblox-link-mad-city_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-kat-hack_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-hack-roblox-if-u-forgoten-your-password_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-on-tablet-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-cheat-script-auto-farm-super-power-training-simulator_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/may-2021-best-free-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-girl-hair-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-quad-bike-roblox-bloxburg_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-hack-glitch_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-infinite-jump-script-hack_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-free-robux-trackid-sp006_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310F 22816 bytes
SHA-256: 90a052556a400bf41beb567182199b65aade3c7fd33e705d75be562a4b8633bd
font_01_sfnt_off000063fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 18240 bytes
SHA-256: 88c1583924e4df7bbca9c9847ac4d52f5c04679015d4c663ed573c82f3a7ef36

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