Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef3faba6cc67c01…

MALICIOUS

PDF

44.6 KB Created: 2020-07-08 23:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 876695bca1943142b196f5489e40e196 SHA-1: 4089f74d324edd54a0565af859d9558e7f2c3da8 SHA-256: 8ef3faba6cc67c01b6f9aa727c221e3eea814cfbf9b351cf5605d2a0f80f996e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified as a link farm, designed to redirect users to external websites. One of the primary links, 'https://ttraff.ru/wb?keyword=soft%20pastel%20techniques%20worksheet', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=soft%20pastel%20techniques%20worksheet In PDF document text
    • http://files.creekcitygraphics.com/uploads/1/3/1/3/131380953/xakumi_reluwate_mokapufox.pdfIn PDF document text
    • http://files.savebozeman.org/uploads/1/3/1/4/131408529/80336d.pdfIn PDF document text
    • http://files.quantumpoint.org/uploads/1/3/0/8/130874031/fexurugomaseba_livorejalolokib_kuluvewowa.pdfIn PDF document text
    • http://files.facesdayspa.com/uploads/1/3/1/8/131871762/rovolozotewer-vufeg-guvagejupekele-pobuvopis.pdfIn PDF document text
    • http://files.luisaluisa.com/uploads/1/3/1/3/131398133/5525725.pdfIn PDF document text
    • http://files.afmsupplements.com/uploads/1/3/2/3/132302815/972851.pdfIn PDF document text
    • http://files.royalmarineser.com/uploads/1/3/1/0/131070911/8239271.pdfIn PDF document text
    • http://files.stspain.com/uploads/1/3/0/7/130776575/7eb48.pdfIn PDF document text
    • http://files.kirstencole.com/uploads/1/3/0/7/130776481/temeliribeki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pegubup.files.wordpress.com/2020/06/zikusagojar.pdfIn PDF document text
    • https://kizutakogoz.files.wordpress.com/2020/07/modupuvuwo.pdfIn PDF document text
    • https://gefijapowiv.files.wordpress.com/2020/07/69900746860.pdfIn PDF document text
    • https://sexepik.files.wordpress.com/2020/07/rekesom.pdfIn PDF document text
    • https://tigizenawa.files.wordpress.com/2020/06/51739183883.pdfIn PDF document text
    • https://vujatuzine.files.wordpress.com/2020/06/11719023257.pdfIn PDF document text
    • https://jubasejoxes.files.wordpress.com/2020/07/gemisokaleneposuxogiwir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000708c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 5372 bytes
SHA-256: 0c10f12cea6fd01b70d77065489006944803513e6dbfb82866beda9e56f025f7
font_01_sfnt_off000082d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D1 10088 bytes
SHA-256: 23254142d0f6be02609e831941a13e66dcb2abd357cd39f2cd7ea1fb72c4b96b