Malicious PDF — malware analysis report

Static analysis result for SHA-256 867a81a359d933c3…

MALICIOUS

PDF

46.8 KB Created: 2020-09-01 00:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154f64f9fb587a327e6fbe5aa15babf5 SHA-1: ff0f8468cb7b3a4145496eac0df075dc3e01a0ce SHA-256: 867a81a359d933c360c89d3cc1cd7d1ce461fc7094382665ba3f3584a00c37d2
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for antivirus software, which redirects to a malicious URL. This suggests a phishing or social engineering attempt to trick the user into visiting a potentially harmful site. The presence of numerous other PDF links, many pointing to benign content, indicates a link farm strategy, likely to obscure the malicious redirector. No scripts were extracted from this sample.

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.cc/wix?keyword=malwarebytes+antivirus+software+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/85d67f_988b3a8976c243b78aeb00eae2c5b45f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1587aea5e0934618be9b5e73dd47a9df.pdf
    • https://static.usrfiles.com/ugd/850f07_27b8ed62de4f42e3869a0805848d770d.pdf
    • https://cdn.shopify.com/s/files/1/0430/7366/7225/files/78157833554.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/xafaravolegofubotud.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/53148757616.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/aoc_g2590fx_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0306/7038/files/z_for_zachariah_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/zegagobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4817/2710/files/16808606586.pdf
    • https://cdn.shopify.com/s/files/1/0469/4484/5985/files/shopclues_apk_for_android_2._3.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/convert_to_word_software_filehippo.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_off00007839.bin
fe2e92fc66461b970657cdf32238e2bf011a10beacc9c3aa1e7ed5f639d0533f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 5160 bytes
font_01_sfnt_off00008a00.bin
76f940d23fc02cd6e9e6204f568fbabfae25433bde04a12032c5af0dff59cc52
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A00 10704 bytes