Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1ca0a684fde2e0…

MALICIOUS

PDF

51.0 KB Created: 2020-08-31 06:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7828de035ac1bfe5173f6962e6627882 SHA-1: 8bef24ec35b627797aa292d8acba98e9b786ff77 SHA-256: 0f1ca0a684fde2e0690954d9e930867777bdd556e16d49788339c57c612de1e4
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a malicious redirector, disguised as a "Hero siege beginner guide". The ML classifier strongly indicates maliciousness, and the PDF structure includes a link farm, suggesting an attempt to drive traffic to malicious sites. Although no scripts were directly extracted, the presence of embedded URLs and the overall heuristic firings point to a phishing or redirection attack.

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.club/wix?keyword=hero+siege+beginner+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/kudonakum.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/career_options_in_commerce.pdf
    • https://cdn.shopify.com/s/files/1/0447/1685/1356/files/science_lab_safety_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/1028/5983/files/how_to_hack_mw3_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebedaxogatasimilore.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_b20cdae46a0745ea93d4e4cb2576e87c.pdf
    • https://static.usrfiles.com/ugd/40b9e6_5b1a238fbf074fc9a0535cf86dc8fce3.pdf
    • https://static.usrfiles.com/ugd/0f5b72_63d6c8d9d24d4db7bbe9f5a6184c91f1.pdf
    • https://static.usrfiles.com/ugd/ce14f3_4a8936aaccd84063a31470568f31d220.pdf
    • https://static.usrfiles.com/ugd/68ec51_4dec220eef67467780b665f87fcfb380.pdf
    • https://static.usrfiles.com/ugd/87d215_cf11dfb805bd4a27817e227317a8129c.pdf
    • https://static.usrfiles.com/ugd/b8c837_46bbffcbdbcb40a79eeb9796541272a1.pdf
    • https://static.usrfiles.com/ugd/cafc24_9ba86247281a4a49947e5be93eb97ab4.pdf
    • https://static.usrfiles.com/ugd/73cb9e_e8b7d70cb3c94334b59589e7040052ab.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_off00008ad7.bin
0408852348c4fcf02a1fe70f544a674d27ad7455e4e3d5ef497236e109b6eb04
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD7 4852 bytes
font_01_sfnt_off00009b5f.bin
405f225d6fe70d81e5a0503d9d11d8bd0f0d7c0c1b1d1e450f100d2f9e79769f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5F 10420 bytes