Malicious PDF — malware analysis report

Static analysis result for SHA-256 648ce3fffd38d627…

MALICIOUS

PDF

43.1 KB Created: 2020-09-06 13:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6184f208ac39435821243c45380a5d2d SHA-1: 2a2a918681a67cd4a584f364f50f058f0dee576b SHA-256: 648ce3fffd38d62727776d8ac01c1fb252d3466f79cc638ee61679c28b69e81e
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 pointing to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to direct users to potentially 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.link/wix?keyword=berserk+movie+sub+indo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9bd82e_8652fc7ac31b417eb35d20ecd1d45852.pdf
    • https://static.usrfiles.com/ugd/bf07b1_c6b2b016705548fb9bfdf16146195d8f.pdf
    • https://static.usrfiles.com/ugd/affb4a_7c183bbf95b7480282883f8b59a185b1.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/adjustable_rate_mortgage_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/stumble_verb_forms.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/cg_vyapam_bed_ded_answer_key_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2525/9944/files/sumunuwagafeka.pdf
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/east_facing_house_vastu_plan_22x50.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6234/files/13268527195.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/86684615762.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/kegojuloxofojujeni.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e75.bin
bf3eaf8a7fe423fba6c89e2b92f7fd1c9ad7db5dd2d4481021ce16b141f2e2db
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E75 4844 bytes
font_01_sfnt_off00006ec7.bin
f0254b08cbf51f8b73361dc469432f5f6ed2561a6650e79e408059f559df5dc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 10260 bytes
font_02_sfnt_off000091ed.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x91ED 4324 bytes