Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d92d01664a259de…

MALICIOUS

PDF

45.0 KB Created: 2020-09-10 06:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80039ccc12e605acabd81f72bd2aed79 SHA-1: 9cd5ad5eebf0b25d6484bda5a1cd9188e8035d87 SHA-256: 6d92d01664a259debb0ddcbe72ab43637c59870de34dcc2702ee4bafa785c7d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to Shopify and usrfiles.com, suggests a link farm or SEO manipulation tactic to distribute malicious content. The primary malicious IOC is the redirector URL.

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.link/wix?keyword=angleizer+template+tool
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/23e9be_1e56356c76ae4dae92c1868468dd21e5.pdf
    • https://static.usrfiles.com/ugd/96768c_36752aa5f8804c39b4b1a1ddb01af835.pdf
    • https://static.usrfiles.com/ugd/4a6c57_6106fe83e8e64bcbbae90098bb5dfe04.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5165/files/anet_a8_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0463/2861/0971/files/embed_jasper_report_in_php.pdf
    • https://cdn.shopify.com/s/files/1/0439/4565/6488/files/anemia_in_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/west_bengal_hooghly_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/latex_euro_symbol.pdf
    • https://static.usrfiles.com/ugd/de02f3_96cc1545cf204ff38925df5cb3c87031.pdf
    • https://static.usrfiles.com/ugd/aa14a9_0bddc2ea13e84419be4541e5fbcde457.pdf
    • https://static.usrfiles.com/ugd/98e2de_2c5e227853de43c3a5e6077e2893d7cd.pdf
    • https://cdn.shopify.com/s/files/1/0430/3064/2837/files/70341120485.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/monabufogikijim.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/motixaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/9141916782.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ee.bin
e5090c8721455908fb2218aeaddcd1f7a43265edadf8d36a1aec9dd00daa0545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EE 4788 bytes
font_01_sfnt_off00007814.bin
d6b1075b953e0cffb0277bbc16bda4e87f494eeabe916631f7b06879c075b26f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7814 9684 bytes
font_02_sfnt_off00009927.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9927 4324 bytes

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