Malicious PDF — malware analysis report

Static analysis result for SHA-256 85705cefb883967a…

MALICIOUS

PDF

47.4 KB Created: 2020-08-28 12:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f81c1a6656bf369973aa395de2e8f0 SHA-1: 0910471779275302756c15e63f6b23cd4a3306ee SHA-256: 85705cefb883967a9b89615b6a6b342652bc3375b5d7821a1990c3e237d57ce2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that likely serve as lures or further redirection points. The primary attack pattern involves luring the user to click on malicious links within the document.

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.com/pify?keyword=angry+video+game+nerd+bugs+bunny
    • http://files.likemindedsoftware.co/uploads/1/3/2/6/132681464/xosopojexalawim.pdf
    • http://files.applauseandacclaim.com/uploads/1/3/2/6/132681910/purazak-wenimatav.pdf
    • http://duxobosa.sweetccimagery.com/uploads/1/3/0/7/130775075/224a3a99757c5d0.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/74091076465.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1885060089.pdf
    • https://cdn.shopify.com/s/files/1/0466/3243/5877/files/mba_cet_2019_form_last_date.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/2255185624.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/30123779605.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/tevafas.pdf
    • https://cdn.shopify.com/s/files/1/0441/3086/1208/files/best_tryndamere_build.pdf
    • https://cdn.shopify.com/s/files/1/0436/4248/6944/files/shakespearean_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/0907/9458/files/forensic_audit_report_of_il_fs.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/ielts_academic_reading_practice.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/kitokabusiki.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d8d.bin
c8fb62d60f26f5d65d19c6ed460271dfcbb748a2c450a7b14fd2808910251495
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 5204 bytes
font_01_sfnt_off00007f1b.bin
231ee431f532cab87c53a28ce74d4aa8f35468b4f5efb195b4fc7b13d60d7a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1B 10520 bytes
font_02_sfnt_off0000a25f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA25F 4324 bytes