Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b0aa08b0c63c32…

MALICIOUS

PDF

57.9 KB Created: 2020-08-18 15:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11254a8741a11ad6228c061637817eb1 SHA-1: 10ac581dbbc8fab83ea844a11f8b52599f8b53e4 SHA-256: f5b0aa08b0c63c320f1c6d8e42aa5bfe8a779fe2e966f4b84eae9c3a83f4f1a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same keyword 'metformin dosage pcos treatment' as the URL, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for malicious content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=metformin+dosage+pcos+treatment
    • http://midupoxo.woodsongherbs.com/uploads/1/3/1/4/131406390/gudalubagekenux.pdf
    • http://vowow.hostmaster.ampabages.cat/uploads/1/3/1/0/131071041/wutasu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1406/8123/files/fojonetulotomulur.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/47217813843.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/nuverexe.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/riwozivamajuru.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/27222038132.pdf
    • https://cdn.shopify.com/s/files/1/0451/0813/4053/files/neil_degrasse_tyson_accessory_to_war.pdf
    • https://cdn.shopify.com/s/files/1/0452/8282/0257/files/dofuvafizapaveruna.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/59858321196.pdf
    • https://cdn.shopify.com/s/files/1/0436/0785/1171/files/fojove.pdf
    • https://cdn.shopify.com/s/files/1/0435/5935/4517/files/smallpdf_in_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/losotu.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_off0000a3f8.bin
86fac44a25efc6602b53001394e0912e24fead75947d825c5b2b24209ca9b76b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F8 5448 bytes
font_01_sfnt_off0000b672.bin
36c68b5a9733a8911315e1a7275f98a979c8f8feb74aded0b09a120182674a19
pdf-font-stream PDF embedded font (sfnt) at offset 0xB672 10572 bytes