Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ec7387c3713176…

MALICIOUS

PDF

35.9 KB Created: 2020-08-29 17:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da43dccdaa08fbfc2f2e1f53798b9e81 SHA-1: afb298119ce4b544998ec09102db530139592c42 SHA-256: 66ec7387c371317617ee169229f066492f426cc1328230194f7d432c480b020e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The presence of numerous external links suggests an attempt to lure users to potentially harmful websites. The document body is heavily obfuscated, but the embedded URLs are clear indicators of malicious intent.

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.com/wix?keyword=ray+alexander+roundhead+gamefowl
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/934fc3_89076706df21469bba366ca61bb03986.pdf
    • https://static.usrfiles.com/ugd/f4de5e_ff3e05e42e5a46ed883411bf1a1857aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec75e064e67140e6a819ade02fb77d06.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/6625735131.pdf
    • https://cdn.shopify.com/s/files/1/0437/6920/0791/files/95183057641.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6824/files/kowuloxuxokosere.pdf
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/danevi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/funomoziz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/bukuguzi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3966/7877/files/45716251011.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/anabolic_steroid_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/4716/4840/files/god_bless_america_sheet_music_for_trumpet.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_off00004cdf.bin
e8416033e2074974137dd3915be950930c29d95288480239acd540b1e1d6936f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CDF 5412 bytes
font_01_sfnt_off00005f3b.bin
0a8018b93177358210a88b0dfc58c05813515ba2da1b6b010138501963c4321c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 9988 bytes