Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdda7b0a1b89679…

MALICIOUS

PDF

37.5 KB Created: 2020-08-29 23:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ba531e50a36dc7d2e37cd5758672f5c SHA-1: 38dbfb63b064516b90f9b1853fdccad00dadacff SHA-256: 5bdda7b0a1b896792338fb81bd463a08ac4b14affe747f249b01e3bf52aa919a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though heavily obfuscated, contains text related to 'sheet music' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many benign, indicates a potential link farm or SEO poisoning attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=beauty+and+the+beast+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
    • https://static.usrfiles.com/ugd/eaf48f_8659cb52924349258c6a69afeee2382e.pdf
    • https://static.usrfiles.com/ugd/b8c837_146b08c34cde469494a55c87ba4bcac1.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7078/files/asme_b31._4_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/defigutitezapebevurexo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/mossberg_410_pump.pdf
    • https://cdn.shopify.com/s/files/1/0463/6744/1051/files/lariza.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/jupamidirovanivarig.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_off00005414.bin
e877abd49f1251cbeed3eb2d66093b31c89edbe814ad31330d540dfcc3cac5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5414 5344 bytes
font_01_sfnt_off00006612.bin
67fd6850554c189e4b4de17f2653ab4e2964a01ead73cc5e0099dfbcf2bfe39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6612 10444 bytes

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