Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b12a110de6e781c…

MALICIOUS

PDF

53.1 KB Created: 2020-11-09 04:34:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 538389076eb59dffe9e9bca2e8c9ae54 SHA-1: 950f0ad40ec0c54786cf75d766d39c77e0908bd6 SHA-256: 1b12a110de6e781c18fbad3b35321ce5e2e315d100256437a8a25dde11c66ccc
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the embedded URLs, https://gettraff.ru/aws?keyword=3.4+multiplying+rational+numbers+answer+key, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, indicating a lure to a malicious site. No scripts were extracted from this sample.

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://gettraff.ru/aws?keyword=3.4+multiplying+rational+numbers+answer+key
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/tamabalijizoz.pdf
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/1156356.pdf
    • https://xukarujejoxa.weebly.com/uploads/1/3/4/5/134597636/7abdad0bcad6.pdf
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/pasex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdf
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdf
    • https://rogiwojugafi.files.wordpress.com/2020/11/bopifalik.pdf
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdf
    • https://s3.amazonaws.com/gorajikunobixi/radiance_alyson_noel.pdf
    • https://wusuxavekowi.files.wordpress.com/2020/11/84480568930.pdf
    • https://s3.amazonaws.com/fasanag/zoxezurinonupateruretob.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_off00008c3f.bin
f40f3063686a8f6dee0fa374dea737e14473fb137e5799cd4ad733112beb5090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3F 5724 bytes
font_01_sfnt_off00009fd0.bin
9144863e51d6d09891187b50ef644946ceebaf05961057629efafb91c1119df3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD0 11724 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.