Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f250079b688292a…

MALICIOUS

PDF

54.2 KB Created: 2020-08-11 14:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b463289beb0e3cbac4bfb76cc51f607b SHA-1: badff3dd70ac161811bf083934b4e5bbfc708348 SHA-256: 0f250079b688292adc1ed20284118505474df7852f581690f316fb1d8b1d0685
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for sheet music, which is then used to disguise the malicious redirector. The presence of a large number of external PDF links further indicates a link farm or redirection scheme.

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.ru/pify?keyword=a+ha+take+on+me+sheet+music+pdf
    • http://files.tetokiharuru.com/uploads/1/3/1/4/131405940/sebidure_roboduvonitu_damenuvod.pdf
    • http://falez.danieldrucker.org/uploads/1/3/1/3/131383483/nakibej.pdf
    • http://files.holmescreekbc.com/uploads/1/3/2/6/132681625/paxuzaxebu.pdf
    • http://muvup.westtrailmassage.com/uploads/1/3/2/8/132814930/fukujaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/69996932361.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/2390156417.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/75056573417.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/19835134136.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0512/files/tv_guide_lancaster_pa.pdf
    • https://cdn.shopify.com/s/files/1/0440/5706/7685/files/14003611422.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/vujetekegek.pdf
    • https://cdn.shopify.com/s/files/1/0430/8107/2789/files/noseletokexupasid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/snoop_dogg_da_doggfather.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/attorney_client_privilege_waiver_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/24099392276.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_off00008061.bin
0aa783f0180f237bfd5eb8c3934b1d051ef29bbe22dabfdbed4b5fe3ef2109b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8061 5320 bytes
font_01_sfnt_off00009253.bin
58d5d6b21ba689a8ff7ed37427656969c3d2fcc45816a0e6e9e114f33f6b960e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9253 10492 bytes
font_02_sfnt_off0000b677.bin
d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB677 16100 bytes

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