Malicious PDF — malware analysis report

Static analysis result for SHA-256 48efc89b34451809…

MALICIOUS

PDF

45.8 KB Created: 2021-05-19 20:08:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a176eb32b3ce999c94960795fd67681 SHA-1: 09be613b4e6adc99c3fe4895f3c8fb622289c381 SHA-256: 48efc89b344518097ac2b3e75b2405ce18dff07fb883fbbedb984bbff6f6f310
142 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 0.9432

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/a-lot-of-robux-game-hack PDF link annotation
    • http://thomas-hartl.at/images/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/robloxhacks_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://thomas-hartl.at/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://thomas-hartl.at/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000495c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x495C 25416 bytes
SHA-256: 53731fd7e6881af1e612bcffe303dfdf19aa63b35395615fe2b3d51f68f2a4cf
font_01_sfnt_off000084a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A5 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000914d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914D 17952 bytes
SHA-256: 59ace597cf85b15723adf2883f87d3990bd92e723e57ffb30000155e26dd48af

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