Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5c6a1c59143ada…

MALICIOUS

PDF

47.7 KB Created: 2020-08-24 20:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f053e967f605cf4bfe1b8e249898d66e SHA-1: 2eb6f1018d0f93c4c6db15d429ddd6cbc307e454 SHA-256: 0b5c6a1c59143ada3924f09290dc8b4e3d584a9a2cc8a1daaad8147e6452f854
154 Risk Score

Malware Insights

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

The PDF contains embedded links and document body text that direct users to a malicious redirector URL, disguised as a tool for HTML to PDF conversion. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, including one to a known malicious redirector, supports this. The document body text, though partially obfuscated, contains the malicious URL and references the conversion tool, indicating a social engineering lure.

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=html+to+pdf+angular+2
    • http://files.worldgigs.co.uk/uploads/1/3/0/7/130776887/9f2b7.pdf
    • http://buwat.holistic-cooking.org/uploads/1/3/2/6/132681834/3605054.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/41750696051.pdf
    • https://cdn.shopify.com/s/files/1/0431/2648/9249/files/vesefilokosajaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/2849/5001/files/architectural_photography_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0460/2331/1519/files/guided_imagery_meditation_scripts_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/71261280952.pdf
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/15743640839.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9263/files/bhojpuri_song_dj_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4068/files/insanity_workout_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1878/files/android_floating_action_button_image_size.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/fakosevodanowejumorok.pdf
    • https://cdn.shopify.com/s/files/1/0464/6024/0040/files/simple_consulting_agreement_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/ingenieria_genetica_que_es.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d0.bin
7a7353f03641d9d8fe58a0ba270e205ed2fe796f481f4019107ce482685659c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 5276 bytes
font_01_sfnt_off000075aa.bin
15a1a93e543d91485475779971bf7fec7b4ba47b9bac8e6d910522b0281ec8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 11096 bytes
font_02_sfnt_off00009bb2.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB2 16312 bytes

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