Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e4cff3acf55dd7…

MALICIOUS

PDF

39.0 KB Created: 2020-08-30 20:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43efc7e8d98d35460c81ebfd152ece6e SHA-1: b88011127eee4a880ac7fb54861a34ab7fc1ebbd SHA-256: 18e4cff3acf55dd74381e89650224889cd784aac9bcc6324e8298896a23f1a68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to download further content. The PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, likely for SEO manipulation or to distribute the malicious redirector.

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=legend+of+drizzt+graphic+novel+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/89142881580.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/10232675196.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/batodezukugo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5575/7977/files/biceps_exercise_chart.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab181c78135d41809a4d3d37dd25602a.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_070a56f6e10347feac7115d407eae0eb.pdf
    • https://static.usrfiles.com/ugd/b85eb0_67849f46458242c788c2902a43801827.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1ffb517261f4ccfa867406991f5cb14.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d3269b0839740d79e79dbe27f89ce81.pdf
    • https://static.usrfiles.com/ugd/b8c837_da00b4db468d47fd86cf241cd1d0a477.pdf
    • https://static.usrfiles.com/ugd/e2c250_acf2347a2fe04629a961de11a9512006.pdf
    • https://cdn.shopify.com/s/files/1/0433/9541/6213/files/wow_shaman_guide_stats.pdf
    • https://cdn.shopify.com/s/files/1/0432/4448/6824/files/13155737705.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/61310472537.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_off00005938.bin
f7b739e3c75dc3bece88de052835868bcfb301eb8107540c2b1633a9e5afa21f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5938 5288 bytes
font_01_sfnt_off00006b44.bin
5398cc3d74b48ba8580db4e2f0a5fe78bf5c9455c2701552bc4e31fd0c0924b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B44 10428 bytes