Malicious PDF — malware analysis report

Static analysis result for SHA-256 625d11da89e841a9…

MALICIOUS

PDF

48.4 KB Created: 2020-08-06 05:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75184e84f331726b310ee1cbc0123fc5 SHA-1: ebe6bc41fcd9d3ed2418ab688c8d3c183a147656 SHA-256: 625d11da89e841a909b255d7b00331ca4a4cb150335abb8de84f2b33625ca7ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on these links, which likely leads to further malicious content or exploits.

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.cc/pify?keyword=arctocephalus+australis+pdf
    • http://files.caryapexyouthchoir.org/uploads/1/3/0/7/130739510/tazexipiviganul.pdf
    • http://files.purplebroom.com/uploads/1/3/1/0/131071137/zetujaropenu-mozug-lubanam.pdf
    • http://files.troizel.com/uploads/1/3/1/4/131453493/8840033.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/minecraft_bending_servers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5939/6254/files/zalobowidanofosogilafutax.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/binary_code_bracelet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/93779048022.pdf
    • https://cdn.shopify.com/s/files/1/0438/5731/3957/files/back_exercises_for_sciatica.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/nuduzuxowidirejizekenure.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/sawuzuvumuzurowiba.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/best_english_speaking_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/xelaxetunonaguzipo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/7235821503.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/81906974847.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/84844279301.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/96159318205.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_off00008063.bin
1600ce290b5d3088358babda07ea91cb209f817f1f1af554d2533f5f5551ba30
pdf-font-stream PDF embedded font (sfnt) at offset 0x8063 5232 bytes
font_01_sfnt_off0000922c.bin
f2f510822faef9e8825700552ff7d77bd8df8ad3fbb79769beb3e8050bf33f6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x922C 10140 bytes