Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3a7962e51d3f0…

MALICIOUS

PDF

44.3 KB Created: 2020-08-29 19:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c42b487d588c39b26873a3fb4571879 SHA-1: 328fdd9baef350fa4bb6af59b60e3b61a68e73a2 SHA-256: 21f3a7962e51d3f0054120cf1ab77736e3e47a514fb40870df6592052915d2ba
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to a malicious site. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. No scripts were extracted, limiting the analysis of further payload delivery.

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.com/wix?keyword=how+to+be+a+supple+leopard+pdf
    • https://cdn.shopify.com/s/files/1/0428/5536/6822/files/rm_rf_command.pdf
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/physical_chemistry_engel_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0106/9220/files/mathematics_for_economics_and_finance_harrison.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/english_grammar_book_class_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/shampoodle_animal_crossing_hair_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_7eaab494c2c649598140e8a8cbc426e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d679de417aa405f91780757c8d963ec.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/harry_potter_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/fibugaj.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca12ee5d86bb4818a33b6b342d68e22d.pdf
    • https://static.usrfiles.com/ugd/b8c837_98f4388ee5e94d30af131694b62b071d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4c465ee7e6a408c8d8be83b0200bc22.pdf
    • https://static.usrfiles.com/ugd/b8c837_5de571aa4a814e74853fd86afeb77d14.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_off00006f36.bin
4c8952ea121446759ce424c46ccfb87c655bc0bf957300d3a4d43bd471ba9346
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F36 5228 bytes
font_01_sfnt_off00008112.bin
eb23ab1d326a59477555e31cd6575158ffe81382d6d27351f11ca8f33687e9a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8112 10292 bytes