PDF malware analysis — malicious · ae2774a321624309

MALICIOUS

PDF

51.3 KB Created: 2021-06-04 02:10:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24

MD5: b49648e524d9cacc86c22805da718d14 SHA-1: a5d9d54265e426fdd8fbedbdd19cb6f5aa914c47 SHA-256: ae2774a321624309ca07419caecb63f7c6f6701cc8d1023b0320f8968c114522

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The primary malicious activity observed is the redirection to potentially harmful infrastructure, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9685

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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.online/app/431946152/free-robux-live-game-hack In PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/roblox-account-hacked-and-pin-set_GM431946152.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/roblox-re_GM431946152.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/pokemon-go-hack-free-coins-no-human-verification_GM1094591345.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
- https://elibrary.stp-aviasi.ac.id/repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00005128.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5128	25880 bytes
SHA-256: `61f11d449979548df80e39a0e2379b200f8938329b6541df099e8421034aed45`
`font_01_sfnt_off00008bf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8BF4	4068 bytes
SHA-256: `c398be261ce9c2dc7eddf220cc726f94b4967ab3334d4e09ab34fc874741fd7c`
`font_02_sfnt_off000099cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x99CF	3396 bytes
SHA-256: `e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee`
`font_03_sfnt_off0000a5c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA5C2	18248 bytes
SHA-256: `2e5a72f8344bcf9b425e9fd022f0a9c5c2029812f1a4b00ba9f2a8ee504eb572`

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