Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3b257e345a4d8e…

MALICIOUS

PDF

49.2 KB Created: 2020-08-31 19:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3614682ef7ae34c714261c038fb0f03 SHA-1: 117f4d0598a409bb4ecf0f7f76bc6846ca1c2781 SHA-256: 1a3b257e345a4d8e96472ff93ed1b928f10feaf2d05db07e0f3e2c4a7a7b3d0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

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 related to software, likely a lure. The primary malicious indicator is the redirector URL, which is designed to lead users to further 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.ru/pify?keyword=connected+components+workbench+software
    • https://static.usrfiles.com/ugd/6d59ab_51beaa1d3cc843cc8782b4985365af49.pdf
    • https://static.usrfiles.com/ugd/e33828_337c7bf3dd1040d5a0ee2c1e6b65902b.pdf
    • https://static.usrfiles.com/ugd/f0e51d_e564b475d95145c59ad336762d5e12ea.pdf
    • https://static.usrfiles.com/ugd/a2d007_0f3343ebaa5247a99a4483d7dfce9f38.pdf
    • https://static.usrfiles.com/ugd/289c5e_37df532bbc4f4e5d88e6902265332a07.pdf
    • https://static.usrfiles.com/ugd/3dd68e_47774bfb8e674ed79d1bbc9ad1c8a5d1.pdf
    • https://static.usrfiles.com/ugd/0e2875_6e8ef3142de3424c9bb3cedb01a1ab0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_311f7dd521204dd58dfe8bf5f63acd8d.pdf
    • https://static.usrfiles.com/ugd/ca300b_d765c0e04ff14558a496d186baa1a5f7.pdf
    • https://static.usrfiles.com/ugd/39d081_d1d9b5f583834e29bc9308fd1e489df8.pdf
    • https://static.usrfiles.com/ugd/aef5b7_ec61705f5c204b01b30cb5436bb743a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ea50097fd1344778fc09c232cb3b066.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a4506a47f6047d0a94f367898079fad.pdf
    • https://static.usrfiles.com/ugd/9421c8_ac11a26973c04fc7a1d40e688555384f.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/cheppave_chirugali_telugu_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2761/8209/files/convert_html_to_using_php_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/5151181763.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/ags_algebra_1_workbook.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080f5.bin
d0857e018b3eccb0a2d13af380ff42beae029a2c9f36ed7a2e03009c66c8d348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F5 5564 bytes
font_01_sfnt_off000093c1.bin
8e7864099d5ee3f8014a31608e1884db6bafe870ac871a0e25f24acd62fc0907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C1 10352 bytes

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