Malicious PDF — malware analysis report

Static analysis result for SHA-256 8593a0367d8acbc0…

MALICIOUS

PDF

39.4 KB Created: 2020-09-07 04:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e53948b6504f5fdee2252842a0101c79 SHA-1: 289ea615c052220b240427e710e49d256d7d5cdc SHA-256: 8593a0367d8acbc0a52399dde3bab9344b83bcf426a3d1b9850ce6565acd1847
154 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a price comparison for 'metformina clorhidrato 1000 mg'. This link, 'https://ttraff.me/wix?keyword=metformina+clorhidrato+1000+mg+precio', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier strongly indicates malicious intent.

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.me/wix?keyword=metformina+clorhidrato+1000+mg+precio
    • https://cdn.shopify.com/s/files/1/0466/3587/6517/files/52038124754.pdf
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/rajuvaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/watoxefagibirejulujodeg.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/types_of_abnormal_breathing_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zemivok.pdf
    • https://static.usrfiles.com/ugd/868b90_568202b9a71f47daa063d02e1cf16e61.pdf
    • https://static.usrfiles.com/ugd/36d413_d400763fccac4ea4bb385f3cb0e38a57.pdf
    • https://static.usrfiles.com/ugd/516793_f6a90704835a4f2b830ce6fab9cfd2c7.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/52083664645.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/78207751594.pdf
    • https://cdn.shopify.com/s/files/1/0437/9466/1538/files/58363211941.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/godrej_industries_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0436/2859/3315/files/47722809806.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_off00005c76.bin
18d57721437f239c34294c405c5ede3a8c80a24f4c9664aa6dc781debb16a411
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 5592 bytes
font_01_sfnt_off00006f5c.bin
f1574c626aa630787d27f665aeccf176615c5889f4818073f46f6e9bc34b287c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5C 9844 bytes