Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0f319adbdf9d2e…

MALICIOUS

PDF

45.5 KB Created: 2020-07-27 11:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e6f4038b0049c47be7615b3d41d36b SHA-1: f51af2838316679775f274c13e665a2d789078f4 SHA-256: 7d0f319adbdf9d2e1407b59894959b42f428167ec8ee0aac070d5ae6740d60ad
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links points to an attempt to redirect users to harmful content.

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.com/pify?keyword=baby+christmas+songs++free
    • http://files.akrosdayunibers.com/uploads/1/3/0/8/130813461/7531819.pdf
    • http://files.padmasherni.org/uploads/1/3/1/4/131437306/dirodederuv.pdf
    • http://files.marktapparel.com/uploads/1/3/2/6/132682655/wadotajo_zivefezevipapaz_gefatovitemuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7943/files/73094937716.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/25640577966.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/domibovavuvexeferuvepik.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6619/files/pesoxopodesoxike.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/34138581632.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/pewirexeferojanije.pdf
    • https://cdn.shopify.com/s/files/1/0430/6740/8535/files/jimomuzobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8003/2160/files/depuso.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/26003694968.pdf
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/nuvaxexonanunumufoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/movujovat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaduvezumutup.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_off000073b0.bin
d684b1b19702ac8119ff0185673bbe06de247da3be9e8bc7f862665deac26951
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 5344 bytes
font_01_sfnt_off000085b3.bin
03eecd82fea36d35c4cfd3206c5e1909e77dbf0818b25379cec4011b12f4a507
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B3 10356 bytes