Malicious PDF — malware analysis report

Static analysis result for SHA-256 8495c7764e17a9e6…

MALICIOUS

PDF

56.4 KB Created: 2020-08-29 01:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d58ba09a20d7d5d5f5ebfa38b5c63e8c SHA-1: 89ff2913f412f12fd28207abfc3269c8fe5d8445 SHA-256: 8495c7764e17a9e6de8ddfc49d796e93fa9fbbcea5ba15ce1f22ce45a028ee2e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=monster+hunter+sword+guide, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text referencing a "Monster Hunter sword guide" and the malicious URL, suggesting a lure to a malicious site. The presence of numerous other links to Shopify PDFs indicates a link farm tactic, likely to improve SEO for 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.cc/wix?keyword=monster+hunter+sword+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0450/0445/6094/files/bootstrap_css_custom.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/flow_free_extreme_pack_11x11_level_13.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/50574223842.pdf
    • https://cdn.shopify.com/s/files/1/0440/3052/5590/files/51280699804.pdf
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/fannie_mae_income_guidelines_retirement.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/lawowiju.pdf
    • https://cdn.shopify.com/s/files/1/0465/2761/1038/files/cars_fast_as_lightning_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9821/files/65937615296.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/rasomaguniwonebobekin.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/tsa_screener_practice_test_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/29707787208.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/lodakeletunifidofidupifap.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4260/files/don_t_look_back_in_anger_tab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4773/files/gatoxanoludoxuweregu.pdf
    • https://static.usrfiles.com/ugd/b8c837_d36efc66e1ff4671935da6f60229f0b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_947af9e9303c4f1688fa8f30016a1daf.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007123.bin
f96a81bfdf14d010df918c74bf76ff16bf2f522954f47b6e8edd902e1edf0134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7123 3220 bytes
font_01_sfnt_off00007cb0.bin
8780c9e4d02761fa0296047efc64c4f1d2a66faf2dcaf876dc7684bb873ae960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB0 4824 bytes
font_02_sfnt_off00008d23.bin
7a7717073a82f3db547123de9e0da3765bc10603c7b411c579b21ea07090a470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D23 10516 bytes
font_03_sfnt_off0000b11a.bin
313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 16060 bytes
font_04_sfnt_off0000c5af.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 4324 bytes

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