Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d8da9c44ee463d…

MALICIOUS

PDF

36.6 KB Created: 2020-08-30 01:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2678b6868b7e059ca93dcd1b8d8ca093 SHA-1: d382194d0635371f080fcd049bee5122176230af SHA-256: b8d8da9c44ee463d5c3afd57309917f3d5aa8ce22059cd86ae5489d0fc6de720
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=essential+oils+pocket+reference+guide'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same malicious URL and references to 'essential oils pocket reference guide', suggesting a lure.

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.ru/wix?keyword=essential+oils+pocket+reference+guide
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/25941628064.pdf
    • https://cdn.shopify.com/s/files/1/0434/0255/9655/files/chapter_19_to_kill_a_mockingbird.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/14380648435.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/ge_stoves_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/15260865956.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/alternatives_conomiques_gratuit.pdf
    • https://static.usrfiles.com/ugd/0a593f_33409430a650401ca3015ccfd3a0db82.pdf
    • https://static.usrfiles.com/ugd/b8c837_941a267a2d6b460f93fc17b5f551428b.pdf
    • https://static.usrfiles.com/ugd/a771bd_18a4618e3ab84da6bb1e4432ca2bb13d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a4f14071a4c426f88c4eb5238b1e70f.pdf
    • https://static.usrfiles.com/ugd/a382ee_c0c7b5a12474463a872389801fce5999.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/45824941569.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/xeguwalofijifudufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/sesojijosolijevupelebivev.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_off00005180.bin
b21821719b218fd445c12451a922af44e2d933fb0d3a565194871aa10cc8ab5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5180 5344 bytes
font_01_sfnt_off000063bb.bin
64cdba8117531e7f65fe65f465b4b19732f012b6e96baa62ad855a7987c3a688
pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 10132 bytes