Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f81fdc5ed28374…

MALICIOUS

PDF

33.7 KB Created: 2020-09-01 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b58ce0eb54b2102b85f19549aecfcf21 SHA-1: b4def5c4cf6bf2b023cb33669531cc83e37f9d6c SHA-256: 12f81fdc5ed2837450f6007942a8d935c8cad51a75dd26a0fd57d512e327a155
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a 'ms access application free' keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this malicious intent. While no scripts were extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to a malicious site, likely for phishing or malware distribution.

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=ms+access+application+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/bse_odisha_history_book.pdf
    • https://cdn.shopify.com/s/files/1/0459/2585/9495/files/carpal_tunnel_exercises_after_surgery.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/wavovizexodufa.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0c3c45da79249788ec0ee31b601bc21.pdf
    • https://static.usrfiles.com/ugd/409ca8_3d9250b902dc4ef88d853ad06f519f9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9409c01551b4dadba2efda7128ec2df.pdf
    • https://static.usrfiles.com/ugd/bd5c68_c5b51251fff54d64897bdd5c2349f918.pdf
    • https://static.usrfiles.com/ugd/b8c837_51de7105e05e4e798e6da468956b3eb4.pdf
    • https://static.usrfiles.com/ugd/0f1814_fb86b23aa2d24186ad2f6dadd7490814.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6119add9b6548a69bda4b1565afe2f1.pdf
    • https://static.usrfiles.com/ugd/5438e3_943cf6447c254850ac28ff73c6bc0e0f.pdf
    • https://static.usrfiles.com/ugd/191a6d_466dd7773ca241d5bdffe8ac1ce54624.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d10fabd072346dda4cf7dba52b25347.pdf
    • https://static.usrfiles.com/ugd/49be48_ef9a9986297441aab63bd1ec6085741c.pdf
    • https://static.usrfiles.com/ugd/b8c837_23a6596119524cc8bfee711c6534483c.pdf
    • https://static.usrfiles.com/ugd/a43ec6_ca9fea5782614649af8c38e7071fa2b8.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_off00004713.bin
27cf538ad4b278c8add9e914d766fa3db993e9e195378898747d608881e32cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4713 5012 bytes
font_01_sfnt_off00005839.bin
404c899802b02d658f0828c1aacf2c8733c756269a43ac79a0620594802c2899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5839 9888 bytes

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