Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d43c701c41ac20e…

MALICIOUS

PDF

43.7 KB Created: 2021-06-09 09:51:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bf97eb4a8e0b7fd2d53ded70f3007faf SHA-1: 5be407167634bac81314b64957a58f6830391e34 SHA-256: 5d43c701c41ac20e26117fd47c728571c8f0f4092b2511e3409ae0316c4196c5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, masquerading as game hacks and free currency generators. These links likely serve to funnel users to malicious websites or download further malware. The presence of numerous external PDF links suggests a link farm designed for SEO manipulation, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/bloxburg-fun-free-robux-game-hack In PDF document text
    • https://www.manmed.info:443/images/free-roblox-abs-t-shirt_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-be-a-hacker-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/cheat-roblox-vehicle-simulator-money_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-book_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-pokemon-go-accounts-level-35_GM1094591345.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_004_off0000507a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507A 24324 bytes
SHA-256: 3aa4eed1af4c18c5cd4d97011cc6935a2ab32da44a6625b3b4b6fd5a8f61ba5f
font_01_sfnt_off00008801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8801 18376 bytes
SHA-256: 352b45df8061121dcb79c9552ef6784447b273d0d4198bd63e0056cc77796700

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