Malicious PDF — malware analysis report

Static analysis result for SHA-256 553a2cf2091b9d10…

MALICIOUS

PDF

43.9 KB Created: 2021-05-12 06:37:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fad39c7a4fa84171a175360c677b1cfb SHA-1: 561b16104e12e09f4d75f1d83a9ef7567bd21407 SHA-256: 553a2cf2091b9d10020c5b3e41a283752797e896dc70788b56fd0bde30644c95
182 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized pages promising game hacks and free in-game currency. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_SEO_LINK_FARM' strongly indicate a scam or phishing attempt. The document body, though heavily obfuscated, contains URLs that align with this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 6

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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
  • 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/406889139/spin-coin-master-game-hack PDF link annotation
    • https://www.prodex-holz.cz/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/roblox-g_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-level-4_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/robux-prices_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/minecraft-bedrock-free-with-java_GM479516143.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_off0000483e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x483E 24740 bytes
SHA-256: f98d4acce6ec4dfa793e7bc26243603df916f3b4b21e22459dc486ed68af3c6b
font_01_sfnt_off000080e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E7 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00008a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A87 17724 bytes
SHA-256: a288a8875d4658f6069a8caac4ff820547a50f75967c18edc494040e7262f101

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