Malicious PDF — malware analysis report

Static analysis result for SHA-256 6594c048a7090def…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 09:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adcd8ee5a053f78f001131c4c4ff63c5 SHA-1: 2b8c4508d759afc8dfc2d35289f5f938265341ca SHA-256: 6594c048a7090def44797b735ab89d46848e07012d357c1d892be7be6b967ffc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'carnatic music lessons for beginners', directing users to a malicious redirector. This suggests a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wix?keyword=carnatic+music+lessons+for+beginners
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_47e9a429be1e4763a90f3b4f09320ff2.pdf
    • https://static.usrfiles.com/ugd/7f16bd_820e884d1a154234af010d540606171d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f15cece40b245d68ae428b28317248d.pdf
    • https://static.usrfiles.com/ugd/66c878_1fe341c8caaa40e29dc968cdd4ea3e5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_85c7820eb54844d08260ac1d8828e10a.pdf
    • https://static.usrfiles.com/ugd/10e3af_a6bfe3ac0be4457d9020e2e975aeb68e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6daeec956dc4b1891dab3b63d0089a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee97749bb1d04e2f90c42d5872c6ea91.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96626323422.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/49827036781.pdf
    • https://static.usrfiles.com/ugd/837d34_6f0ebf2a96e448d1bccb46bad15fcd2b.pdf
    • https://static.usrfiles.com/ugd/ddb60a_e84bfa639f3147c590ea99dbb2c35040.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1d7f7b7a9fa4410bb39b8d6906269d2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006558.bin
e1857d0479d1550bbaee73b8d462fb0cab0cae5dedd10191599ddc472e26d48e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6558 5248 bytes
font_01_sfnt_off00007712.bin
3c5d63b020ce42a2c74ea02399814412defa9170f9ee8d8062762e773cd34547
pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 10344 bytes