Malicious PDF — malware analysis report

Static analysis result for SHA-256 0303658ee7769886…

MALICIOUS

PDF

61.0 KB Created: 2020-09-02 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcf9e6eec0bda7592aa9ec0da632bce3 SHA-1: 06b2f3e89d50109835e01e284d2f2f66a531ffdb SHA-256: 0303658ee77698861a85e83ac77280ef184e86788067fd53c4d01d60a4412aaf
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=factoring+practice+worksheet+algebra+2+answers'. The document body, though heavily obfuscated, contains text related to factoring worksheets, suggesting a lure. The presence of many external PDF links, some hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute 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/wix?keyword=factoring+practice+worksheet+algebra+2+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/segekujifajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/zotoxijosowetisefelivoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/a_plus_certification.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1125/files/32020718013.pdf
    • https://static.usrfiles.com/ugd/51c472_4b7d21e8f32b4518bf026ff9cd93c809.pdf
    • https://static.usrfiles.com/ugd/2ca22b_afb93329c1254d4dbc83160f231ad08c.pdf
    • https://static.usrfiles.com/ugd/e2f197_c2096b5efeff475691e0cd3a0491e618.pdf
    • https://static.usrfiles.com/ugd/23e9be_c617820d7cb54ab3bd4e985b33ade204.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/ditoruwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2097/4242/files/52137238301.pdf
    • https://static.usrfiles.com/ugd/99965f_113e889de373463a90d056d502571270.pdf
    • https://static.usrfiles.com/ugd/7e6083_689e451e512249e8bb205d6cb9e47f91.pdf
    • https://static.usrfiles.com/ugd/5ed537_990572a7f5144cc6a1cefbfff196bc8a.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_off000098af.bin
a150fb2038446951a35694129d258d5680bc82f534de401c98d6d0948e72d774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AF 5368 bytes
font_01_sfnt_off0000aaf6.bin
6e57d13f436bfe5fd152c741d3afe6e99643b06c210757691c257203474ad588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF6 14268 bytes
font_02_sfnt_off0000d877.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 4324 bytes

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