Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c536a165d640286…

MALICIOUS

PDF

39.8 KB Created: 2020-08-24 01:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0095e761b2368eff55533499361d0d7d SHA-1: 006392a1ec804b4e408cf4ae5f74e6e6fe77b632 SHA-256: 0c536a165d64028688f4898e021fc4511d6f45aba33a86a82b1ade0362bbb189
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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/pify?keyword=bamc+hospital+information+desk
    • http://jenuki.danalockhart.com/uploads/1/3/1/4/131438379/9579537.pdf
    • http://files.termarkleather.com/uploads/1/3/0/7/130738553/gatuge-wupajitatipojo-xomupi-zuvul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/connection_string_in_web_config.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/potani.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/2020_myanmar_census_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/tuzebinojarobukenoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/nazukotujopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/26276658102.pdf
    • https://cdn.shopify.com/s/files/1/0437/4206/8887/files/44360242542.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/41686423279.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/46561744846.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/70695308717.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/cch_ct_file_t_foxit_reader.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/69586602796.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_off00005c90.bin
d102ac47974b2c7e8e713f295c71811823f2cb9cc73d6259bd5ac37825286c71
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C90 5508 bytes
font_01_sfnt_off00006f21.bin
a5f42772a3c08282bf9037bf73d000bc22429a62ecb006a0b8da8fe6edad6382
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 10456 bytes