Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b894d23d786dcc…

MALICIOUS

PDF

33.3 KB Created: 2020-08-20 02:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7daa86fc69d060f48438c9987d218d79 SHA-1: 6b84e9bc0340b058022508ef5738c1b0d249ad76 SHA-256: 09b894d23d786dcc1598b4fe486490cdf0145c7d54f95b58ab2b0c7aac0906dd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to sheet music. The presence of many external PDF links, some benign and some potentially malicious, suggests an attempt to distribute further content or lead users to malicious sites. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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=wild+one+jerry+lee+lewis+sheet+music
    • http://files.juliasherry.com/uploads/1/3/0/8/130814043/8226071.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2509/5062/files/surrealism_in_literature.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/19870230338.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4440/files/71608570976.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/33000860011.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/beyond_compare_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/convert_to_dwg_autocad_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/lagutubuzemiduxeburumawup.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/patifo.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_off00004563.bin
13741d38aee2798d4523eae203dccf292b30cc40f69bc42cf2da02020d1948aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4563 5252 bytes
font_01_sfnt_off00005733.bin
f39f60e73df027134764645e39e435d0263d596cfff91bf787466d141d53c4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5733 9708 bytes

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