Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a495efaea17acb5…

MALICIOUS

PDF

47.8 KB Created: 2020-09-09 10:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4da397f8617515b2579ccb04665aa551 SHA-1: e177f3805ff4e177d413031b9700d9e0464446cb SHA-256: 3a495efaea17acb5f405ae14a3c4a066a534aa8053eb651b4295963d58d4ca14
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also 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.club/wix?keyword=all+romantic+silent+song In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7272/4885/files/anand_telugu_full_movie_hd_1080p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8388/1893/files/asmaul_husna_bangla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9123/7794/files/notosan_myanmar_font_ttf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f80014_8a2456d7ce844580b5c67cefd15d0c4e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/voltage_regulator_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/vazodot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/bise_lahore_10th_result_2020_gazette_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/antenna_design_parameters.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/40336e_f75f13ee4c7f4106aaa9b023db91079a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/47b1e8_d681b3dbdb9442e3811b245567071856.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7140 4896 bytes
SHA-256: e7f454c67f6b13ebe4a9463fca7438d9440182623149a82c06a8831e3bdc7b88
font_01_sfnt_off000081b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 10340 bytes
SHA-256: e5649e73ffcc55b4b37382bdaee2df1124c3d2d6194672c973371d45d2195723
font_02_sfnt_off0000a426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA426 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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