Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b715677cc5e276d…

MALICIOUS

PDF

50.5 KB Created: 2020-08-31 18:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fefe56f321b74223e1c095116f6fb2be SHA-1: e528d177ad382bf541771c06e842e91ee77bd510 SHA-256: 5b715677cc5e276d4d6649be0dbc6045df15119892a7c38f80136b296626136d
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a prominent link that redirects to malicious infrastructure, disguised as a download for cracked VPN software. This is supported by heuristics indicating a malicious redirector link and a link farm, along with the presence of urgency and download button lures in the document body. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.cc/wix?keyword=x+vpn+premium+apk+cracked
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e20c63f2fa844a8293d529830eaeef1e.pdf
    • https://static.usrfiles.com/ugd/9757e7_8862365e31694761ac66dfeaec269b94.pdf
    • https://static.usrfiles.com/ugd/affaa6_a18a6f0be37f459ca322887d43cd106b.pdf
    • https://static.usrfiles.com/ugd/eb4c03_052569570fac4e9dabc3fc3a0eab26d4.pdf
    • https://static.usrfiles.com/ugd/72b0e7_9fb84db5faad4e619a2f851ffdbc91c8.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/tikakeregav.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/free_apps_ios_7._1._2.pdf
    • https://cdn.shopify.com/s/files/1/0447/5315/8298/files/broadcast_news_writing.pdf
    • https://cdn.shopify.com/s/files/1/0466/4190/5829/files/mawetoxolozum.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/78524600131.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/meluveduj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/29561144074.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/85925966293.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072d3.bin
3710ea05c60113af188a64abee61603bae7d1b1fe531c475248b8bf46e7cf06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 5112 bytes
font_01_sfnt_off00008423.bin
fca72c75ea7ceab1444f4b1e7555805bd4742f8605bf40de6bc56181716d9976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8423 10324 bytes
font_02_sfnt_off0000a7a0.bin
a313b24da4090b5f304744a95c3a41fb7daacc4794897af84774029b22dee273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A0 16120 bytes

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