Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc2a5616024182e…

MALICIOUS

PDF

50.2 KB Created: 2020-08-31 08:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79cae297e4f85ca05450e5cf66027b82 SHA-1: 24d51857ae99d51ca9e015fe6578b20cb0c0a0be SHA-256: 5cc2a5616024182e35ef4e6b042317984a7945fcd73b8efdc005f99d4a0b0c49
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.com/wix?keyword=shadows+of+brimstone+frontier+town
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_447a6753bb234add81661ee07112d95c.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_c54440c0bfc742348d6f4d4137f88bce.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7163694d3c2420f8f09a255e1cdfa80.pdf
    • https://static.usrfiles.com/ugd/83e24f_35f2cfc9d42d4190bd3d6e4a5d922b6f.pdf
    • https://static.usrfiles.com/ugd/e23fbb_14de8164f80d4d48aa61e34c1ae068ad.pdf
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/foam_sheet_crafts_for_toddlers.pdf
    • https://static.usrfiles.com/ugd/eda9ba_875c0b138670488287ae0bcc72aacb04.pdf
    • https://static.usrfiles.com/ugd/5ecadc_7de760a0fc2a480aa5a5e581609a5451.pdf
    • https://static.usrfiles.com/ugd/b8c837_221e863d8c2e4f82b484c1aacc21ca16.pdf
    • https://static.usrfiles.com/ugd/32777b_1df76f9135f14d00a2dfcaff6d8d3c9d.pdf
    • https://static.usrfiles.com/ugd/7598fa_89caf02a48fe45dda2bce69aeda6059a.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/43716260877.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/72938099462.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/54237057239.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4404/files/96828719711.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009ef8.bin
4e1c13048aaa01774d9ad4484a1d4f539c756585de783e6d5a69ad2339a36781		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9EF8 18552 bytes
font_00_sfnt_off000069f7.bin
a0f646b54a5198db58b12a667c847120ab718b5952a41d2c8d3a887e2f617974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F7 5448 bytes
font_01_sfnt_off00007c6b.bin
e5c6c5d7b03d17c73e495e4b6954dff068fec854cb7aa8d5f92b099f325a07bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6B 10024 bytes

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