Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5f46ad8e8854ad…

MALICIOUS

PDF

42.2 KB Created: 2020-08-25 00:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04121b0e958d55a303a4c840279e9a91 SHA-1: 357b1e411bed890e5de614f277dc0e939b2addc5 SHA-256: 5f5f46ad8e8854adf6c85abd374bfa1e89d26d9fc709b4f93df28023ce1abec2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading free software. This suggests a phishing or scam attempt designed to redirect users to malicious sites.

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/pify?keyword=browser+for+pc+free++latest+version
    • http://budebo.ugec.club/uploads/1/3/2/6/132681352/f99f4e803a0328c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/arch_linux_list_manually_installed_packages.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8244/files/92443996186.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/81974390551.pdf
    • https://cdn.shopify.com/s/files/1/0433/4354/4488/files/aircraft_maintenance_programme.pdf
    • https://cdn.shopify.com/s/files/1/0438/7504/1435/files/27903712535.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/61890604539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0434/6032/9637/files/odisha_reporter_jilla.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/14204388264.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/vexatugelex.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/how_to_take_user_input_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0435/2737/2955/files/87444948666.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/alif_novel_complete_download.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_off000066ed.bin
c391d4e83ca62557f9aef81248446ef906929a39ba7e27cca4f0d3d5a772b9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x66ED 5208 bytes
font_01_sfnt_off000078d0.bin
3cb5746071c6f3a051944c55664c7ac30322b9035d75d3e7f1e1ff6e668ab87f
pdf-font-stream PDF embedded font (sfnt) at offset 0x78D0 10368 bytes