Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d486bae9952649…

MALICIOUS

PDF

48.9 KB Created: 2021-05-15 15:41:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 385242b14171311f04e78995458edf7c SHA-1: 5bf8ade832880d153c75570080d212ecf0b070b4 SHA-256: 79d486bae9952649f754ade1e06355864b7d97c989a6a4c4b200d54621a2861e
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, including one to a known malicious redirector, disguised as a 'free generator / game hack' lure. It also presents a fake CAPTCHA to trick users into interacting with the document, likely leading to further malicious sites or downloads. The presence of multiple SEO-optimized PDF links suggests an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/get-free-robux-info-game-hack In PDF document text
    • http://vokna.by/images/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://vokna.by/images/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://vokna.by/images/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://vokna.by/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://vokna.by/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://vokna.by/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://vokna.by/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/i-want-robux_GM431946152.pdfIn PDF document text
    • http://vokna.by/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://vokna.by/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.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.

FilenameKindSourceSize
stream_003_off000049b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B8 26348 bytes
SHA-256: 1b275efa3a086dc50543826c31b3ec05c2da3d99a750c147ff57a9ae40dcba67
font_01_sfnt_off00008618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8618 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC2 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD4 18120 bytes
SHA-256: 6e6e8bb7c0e640fc67837f70826b1bbd381eb05acf75ec047415621944091573

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