Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3d1c285a1f3cae…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 01:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 628803cea89b0c0a5aaf781b8ba074b9 SHA-1: 9d89a1c34c2de6a186f73f52569c8c26701cf9fc SHA-256: 5d3d1c285a1f3cae2f16b3dcf01466a0bbface0f6a1c891534ece078ded2fbca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a cookbook and the authoring application, suggesting a lure. The presence of a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or phishing.

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=wheat+belly+cookbook+150+recipes+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/basketball_stars_mod_apk_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4741/files/taduxupaxekunowomuzus.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/59091187281.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/ashrae_psychrometric_analysis_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5833/9733/files/30170486340.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c283542dd054f8287c4545160b60715.pdf
    • https://static.usrfiles.com/ugd/19103d_fd9ac6487c6b4044890fb51dcb41fe60.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_919c3fab6589414996607ab09c6c807d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bec7bd20ef2441ba72da88219e6da27.pdf
    • https://cdn.shopify.com/s/files/1/0471/0642/4982/files/vuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/37678241138.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/ebook_effortless_english_full.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/neverwinter_character_creation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/italics_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0461/9780/1111/files/mojezonobujuvosavadibepu.pdf
    • https://cdn.shopify.com/s/files/1/0444/3848/7206/files/create_fillable_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0465/4733/7374/files/66820094283.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_off00006bf6.bin
dd8da7f02d30beea82fbd59201994e6bdb006379b1ae876994a8b98fc795c205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF6 5880 bytes
font_01_sfnt_off00008003.bin
46c25d73ab23451202f81262a33640359ad3bb543dc513dec0f3581e9cab7ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8003 10364 bytes

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