Malicious PDF — malware analysis report

Static analysis result for SHA-256 42944672b273f77b…

MALICIOUS

PDF

53.8 KB Created: 2021-05-15 09:32:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2c18385ed831038e2b30e03d06c6d862 SHA-1: aa545f54e59eb12723d6c3c0d1c265d45593a5b2 SHA-256: 42944672b273f77bf3c4e2e9897ffc37bc61ade195f90b92ed539a5eeffea9b5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external websites, including known malicious redirectors and link farms. The document body and embedded links promote 'free Robux' or 'Coin Master spins', indicating a phishing or scam attempt. The presence of embedded URLs and the nature of the lures suggest a malicious document, likely delivered as a spearphishing attachment, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9365

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.xyz/app/431946152/ways-to-get-free-robux-2021-game-hack In PDF document text
    • https://ballaratcaravans.com.au/images/robux-link_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/roblox-free-draw_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/free-100-robux_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://ballaratcaravans.com.au/images/free-coin-master-hacks-no-verification_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_off00004be4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE4 24924 bytes
SHA-256: 5796575652800d44214d2aea1301f006f52361a4bf94ca39fe7d57b83e068ee5
font_01_sfnt_off000085a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A2 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000ad7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7E 19128 bytes
SHA-256: 23f4c6d0bfdce0b55b29b4c4e1f8fc5f357783b93db13de52c4fadcc57c1eadd

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