Malicious PDF — malware analysis report

Static analysis result for SHA-256 efca61c558f22dfa…

MALICIOUS

PDF

34.0 KB Created: 2020-08-03 06:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28aad8d936be4bf47330233bc91fdc62 SHA-1: a2ece24c1782990a4fb1643251f2b321c8138110 SHA-256: efca61c558f22dfa61023cd6473da94800a19cf6f933cef77062a397fad2cf93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of the redirection chain. The primary malicious URL identified is https://ttraff.com/pify?keyword=database+systems+coronel+pdf, which is used to redirect users to other potentially malicious or phishing sites.

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=database+systems+coronel+pdf
    • http://files.theresearchmonster.com/uploads/1/3/1/3/131380842/silij.pdf
    • http://files.dnewzdesign.com/uploads/1/3/0/9/130969700/ab53a4e1f.pdf
    • http://files.swissmountfarms.com/uploads/1/3/0/7/130776812/zokapi_pamotigavijeje.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/typing_web_hack.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/97210337655.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/32143622751.pdf
    • https://cdn.shopify.com/s/files/1/0438/2549/6221/files/63273482355.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/pelaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/14769089373.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3750/files/slack_emoji_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/120_pounds_in_kg.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/30374754890.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/sizatulizu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2053/files/monemimogeta.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/76247894953.pdf
    • https://cdn.shopify.com/s/files/1/0435/0941/6095/files/jmeter_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/3903/9388/files/git_remove_folder.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004640.bin
17c19fb67004329ccd04d5f0d02856675595313750e75eb7ac5bdbfc6df252ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4640 5540 bytes
font_01_sfnt_off00005904.bin
f009b5f53bfaaf905b97e0a4f65e98cd91ced17084419d8ecdbb82f5cc009cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5904 9512 bytes

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