Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af4ac7a3c09715d…

MALICIOUS

PDF

40.8 KB Created: 2020-09-13 05:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd3975dc270c5005de3d6e61a234a1e6 SHA-1: 916571f38116661945ecd5d18b7e9cad1ab2cfb1 SHA-256: 6af4ac7a3c09715ddf84053a4d01f7aed3fcb885b46223563c3777682be7a780
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the text 'Mr smith goes to washington worksheet pdf' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware 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.link/pify?keyword=mr+smith+goes+to+washington+worksheet+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8da65f_5e983089dc784c5dbcc0436de47c8599.pdf
    • https://static.usrfiles.com/ugd/8acad3_6d521f980d524a3892b4dd9c2d486d66.pdf
    • https://static.usrfiles.com/ugd/227d0f_2e9c58c605a2459393136d3f30a47efa.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9557/files/sokemiwasen.pdf
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/lusokudugivaxamoxifijufi.pdf
    • https://static.usrfiles.com/ugd/b96e41_e5fa9a191d4d4fac867f77257895768d.pdf
    • https://static.usrfiles.com/ugd/a2de88_db579e4e98f346f08a71367caab0951d.pdf
    • https://static.usrfiles.com/ugd/3bf302_8fd06537b53642019ed4b90fe06fa776.pdf
    • https://static.usrfiles.com/ugd/865d50_06046c7ba0a44b5ca9a06a87fee5fab7.pdf
    • https://static.usrfiles.com/ugd/ea78e0_153ee7782ae9437d8359ded8c1f28f1a.pdf
    • https://cdn.shopify.com/s/files/1/0470/6720/1704/files/10561083150.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/tusipunabiwaserem.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/bokakobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/ciccarelli_psychology_3rd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/homemade_beauty_tips_in_marathi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c7.bin
467a19c94360c0d0dc31abc74756fb2fdc733c10287908000874b1fc350bff8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C7 5584 bytes
font_01_sfnt_off000074ba.bin
09ea33b073ab88562a5697678e2c9dac3cbed2b684870fe41f297631c372133f
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BA 9888 bytes