Malicious PDF — malware analysis report

Static analysis result for SHA-256 681dfb2545091ecd…

MALICIOUS

PDF

33.7 KB Created: 2020-08-31 11:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c80f70891851816c40d66a8c4a6ca92 SHA-1: f74b0829e714b4ef82e42aebebc0abef4e456608 SHA-256: 681dfb2545091ecdf90b642187753dd312acbde44d4fec4e40a7a082d9374f1e
154 Risk Score

Malware Insights

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

The PDF file contains a link disguised as a manual, which redirects to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL strongly indicate a phishing attempt. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of multiple external links suggests an attempt to lead the user to malicious 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.cc/wix?keyword=n+tron+716tx+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/90423f_278b65eb81e644edad4850609d7c66f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0936679e5e8f45da934086d05a081a7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_260a36ff4bd146d7914a3785e69143f1.pdf
    • https://static.usrfiles.com/ugd/314c35_55a3fffee01f4fdc94c6d3224a363a41.pdf
    • https://static.usrfiles.com/ugd/822ecd_f6ad4ab016cc4c83a66edb974f01273e.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/hp_elitebook_8540p.pdf
    • https://cdn.shopify.com/s/files/1/0435/7344/4767/files/3409714269.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/sovudo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/best_e_reader_for.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2115/files/the_leader_s_guide_to_storytelling.pdf
    • https://static.usrfiles.com/ugd/b8c837_275cda56b0994275b542f2aee5bec5c1.pdf
    • https://static.usrfiles.com/ugd/834936_65ef8781baeb47fdab13f55d7c7906df.pdf
    • https://static.usrfiles.com/ugd/73c254_345184299e0c49078a828ba69864ca2b.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_off000044f8.bin
a3bb2b186bbe9e38a8a4befbc1d272039a9f8e5112fef9cd20857c664c934f66
pdf-font-stream PDF embedded font (sfnt) at offset 0x44F8 4976 bytes
font_01_sfnt_off000055e3.bin
ba2d130bf28c0a69debaa040827c35e4e5feec9d6ecb9d1bc58f498a561b940d
pdf-font-stream PDF embedded font (sfnt) at offset 0x55E3 10220 bytes