Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83c2d68478c9961…

MALICIOUS

PDF

60.1 KB Created: 2020-08-29 22:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e550d7a6d038d279ee024d389aba4aaf SHA-1: 26c2bc831dcd3765d15e1afc9ae30c3e94e7151f SHA-256: a83c2d68478c996164380f2743c6ef8600628e1b6580c4a18fa1c1d6ec2df8c4
154 Risk Score

Malware Insights

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

The PDF contains a link to 'ttraff.com', identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the text 'Oral radiology principles and interp' and the same malicious URL, suggesting a lure to a malicious site. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to increase visibility. 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.com/wix?keyword=oral+radiology+principles+and+interp
    • https://cdn.shopify.com/s/files/1/0434/4371/6262/files/stowe_cablevision_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/70060222936.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/beall_s_list_of_predatory_journals_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5309/files/77141769427.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/descargar_camscanner_license_apk_full.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b9e23b4b9934d2db19b0d21ea6496d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcbf6799f44749babae255cc07340476.pdf
    • https://static.usrfiles.com/ugd/93971e_dddb732db7634c28930906bf0ee93098.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/microsoft_word_gantt_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/6015/7855/files/mudisidujasijop.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/79891029993.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/bonurolobeset.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/daxosupevus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fcc.bin
6bc76f73217bd1641bf9985b2e91ea8917c69a38a911700e940697eb87904316
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCC 5156 bytes
font_01_sfnt_off0000b168.bin
b8d066123edf3bc6e515c6c4a5d36a0a6626f1b3a15be4aa885996ce1f18b07e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 10512 bytes
font_02_sfnt_off0000d545.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 4324 bytes