Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d3273100351ad7…

MALICIOUS

PDF

39.5 KB Created: 2020-09-02 21:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 417b8d04f752cff5d2bec4f9619957ec SHA-1: f02ec601dbef56950c120a783e5ee8db39ae76a2 SHA-256: 82d3273100351ad7ab13819f0702bf305095cb6c8375af283c241b001ebea3b3
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to malicious infrastructure. This suggests a phishing attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

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.club/wix?keyword=public+speaking+ebook+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/57861561743.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/powenulitomopuxuginix.pdf
    • https://cdn.shopify.com/s/files/1/0438/3493/3408/files/english_to_portuguese_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7210/files/nisosamogitusoluluwu.pdf
    • https://static.usrfiles.com/ugd/b914b5_bb137901207a4c2192ede01767232a7c.pdf
    • https://static.usrfiles.com/ugd/87a178_092b64e57f80487eb48c8362340e486a.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_0e53d709eeae4ff4a2a6754d69aebbee.pdf
    • https://static.usrfiles.com/ugd/a48928_54006962ec3747baba61d56f4d62a485.pdf
    • https://static.usrfiles.com/ugd/bae363_c4bbefe195bf43edb5e7998f119dd67a.pdf
    • https://static.usrfiles.com/ugd/cb4a18_e0b57171cf77454e952cf283cab44e9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_88b9ef4220b64299b85ebb8981df6e3a.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1623/files/vsco_apk_full_unlocked_2019_ios.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/bekhayali_lyrics_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/juposenurakixu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f0f.bin
7cb1ae617ed2af3ea1f35be7201656e6204b043b200890e6b09ebecf3a58f4f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0F 5236 bytes
font_01_sfnt_off000060da.bin
081f58a06875141aaa36cf9e2b5aa302621da0a6653bd30550600ba5b169a2f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DA 10008 bytes
font_02_sfnt_off0000832d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832D 4324 bytes

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