Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3d269e156bfcf3…

MALICIOUS

PDF

32.3 KB Created: 2020-08-12 14:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 944217241165c99023038cc08710aa9f SHA-1: c08434f6128b34bc57e85ab41e8076894ac64092 SHA-256: 5a3d269e156bfcf34777a8aab96718208819b497a855b72de853e2b58e72bc4d
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 benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and benign links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=biblia+peshitta+pdf+gratis
    • http://mevoxize.abigailgallagherportfolio.org/uploads/1/3/0/7/130776257/cd2e64ad3aa4.pdf
    • http://files.asklisaraimondo.com/uploads/1/3/1/4/131438188/mejibevof-buvimejow-famunojaxetek.pdf
    • http://juxip.teriannestanley.com/uploads/1/3/1/4/131408849/gepepafikoruj_xoderugitupak_sexenimovaloj_tabuduveputodos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/jolajumujejize.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/nutezodujepirarapojizuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/79971302202.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/34904852854.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/12594895535.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/wibiruxewozewogebibesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/rovobatu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4242/files/nitro_to_word_converter_crack_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5395/4710/files/defiko.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_off000042a7.bin
6b137a3631fc3d58b2c730b70777880f8b4307390e646df17ea24799f0322f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x42A7 5492 bytes
font_01_sfnt_off00005540.bin
74c31c31a6e6b9665c837321fb54328f27e38599115d1751da5db4b34a8d5d27
pdf-font-stream PDF embedded font (sfnt) at offset 0x5540 9308 bytes