Malicious PDF — malware analysis report

Static analysis result for SHA-256 046da76856ac7459…

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 12:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a828847287551299c83a9589c6d67e9 SHA-1: 508dfe6e3fc48983f840ab645e8c2c7bfe70b6e1 SHA-256: 046da76856ac7459244b602d7aec66f2df59144cbe2053b3fb4a8c181fc14848
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a dictionary download. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic shows it is part of a link farm. Although no scripts were extracted, the presence of a malicious redirector URL and the visual download button lure suggest an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=oxford+duden+pictorial+english+dictionary+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/bittorrent_search_movies_free.pdf
    • https://cdn.shopify.com/s/files/1/0445/7719/4148/files/discord_css_text.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/creature_3d_song_ming_se.pdf
    • https://cdn.shopify.com/s/files/1/0430/8153/1541/files/97068546433.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8354/files/44645921307.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/9517632897.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/wii_u_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0434/6616/2341/files/bisonowasutigojuvujoweso.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6872/files/calendar_template_2019_may_and_june.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/55536769972.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/25486257186.pdf
    • https://cdn.shopify.com/s/files/1/0432/0346/1283/files/93073599027.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/nust_admission_application_form.pdf
    • https://static.usrfiles.com/ugd/c0fca2_b58c42bffad946fc9bb4b28697a00585.pdf
    • https://static.usrfiles.com/ugd/6d59ab_a9ee08acafa241e4ac4245dd0ab7fde5.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_off0000565a.bin
59214e6d78d11db77e8744391dde4168e19437c00997dc93241302059286804b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565A 5704 bytes
font_01_sfnt_off000069e1.bin
58d028ff33c350bdf00b782ee9bfeb7f90a536e4ced2d3bf592c191450e52004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 10480 bytes

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