Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0df7f37eae46ef…

MALICIOUS

PDF

39.2 KB Created: 2020-09-04 04:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df8cbd85c27ccf51579b9fafd5cd5958 SHA-1: fb7a079416649d2a64e458610214dc97a1581b24 SHA-256: 8a0df7f37eae46ef050d33a58fcef3ef6d3726ee07d8ec0a9bd5ed55a34db57d
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.me/wix?keyword=how+to+ask+a+former+coworker+out'. The document body, though heavily obfuscated, appears to contain references to this lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous external links, suggesting a phishing or redirection attempt.

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=how+to+ask+a+former+coworker+out
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/capitulo_5a_actividad_3_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4987/files/born_anxious_keating.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/bigo_live_free_ios.pdf
    • https://cdn.shopify.com/s/files/1/0437/9551/3501/files/43256423567.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/jiwupevepepadusibiri.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b89e0df680240afac0dccc363cee84e.pdf
    • https://static.usrfiles.com/ugd/40512e_2173cfd8dca641b798d3d151bf134348.pdf
    • https://static.usrfiles.com/ugd/b41a9a_10df105f636c4a7a941fb0d7755cebd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d0dcc6942254291ad08b1dd63b43c85.pdf
    • https://static.usrfiles.com/ugd/64f9d2_24e49c2cbaf54c11ac430df8ac14ae1b.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/flowjo_dongle_not_recognized.pdf
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/38824044550.pdf
    • https://cdn.shopify.com/s/files/1/0429/1615/1462/files/ap_human_geography_formal_region_definition.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_off00005d45.bin
8d47b25d46232bae61aef9fc14c490d04217a4180ca31ef10277422c023aeceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D45 5112 bytes
font_01_sfnt_off00006eab.bin
f39dfdd2064e7d007a1232cf116cbb83220381c41c35e440e07e90c67e1ba7f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAB 9836 bytes