Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a7073cc06db11b…

MALICIOUS

PDF

32.8 KB Created: 2020-08-15 19:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33426ea1562bfe38714b8516f65465c8 SHA-1: c706a458555b9c62830a71113072930b9fead53a SHA-256: 47a7073cc06db11b00336af27e95a25b94674a9cbba19b2751dbf445d1f924d3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF file was identified as malicious due to a high ML classifier score and the presence of a critical heuristic firing for a malicious redirector link. The document body contains numerous embedded URLs, forming a link farm hosted on Shopify, which is indicative of SEO manipulation or an attempt to obscure malicious destinations. The primary malicious URL identified is https://ttraff.cc/wb?keyword=nationality%20worksheet%20islcollective, which likely serves as a redirector to further malicious content.

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/wb?keyword=nationality%20worksheet%20islcollective
    • http://files.communitybaptistcoldlake.com/uploads/1/3/0/7/130740323/843dab3b2e.pdf
    • http://files.jedidiahrentals.com/uploads/1/3/1/6/131607093/turaxo-jiwelejojugi-fapazu-tugelosixofuva.pdf
    • http://files.jscsbc.com/uploads/1/3/0/9/130968996/manevobijubaw-nojovotulu-nikizutadudaxi.pdf
    • http://files.cikgusaffuan.com/uploads/1/3/0/7/130740249/bifusotil_pazelovi_zoxuvudewifese_pekijipowa.pdf
    • http://weput.stjohnsfruitland.com/uploads/1/3/1/4/131408854/f8661f5469a8.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/gavadilibimejaxerunumedal.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/amplifier_circuit_diagram_book.pdf
    • https://cdn.shopify.com/s/files/1/0448/0555/4337/files/two_airplanes_flying_together_in_formation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/kojasafuvixolevaluvosoli.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6550/files/5897185568.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/oxford_dictionary_offline_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8315/files/blender_3d_animation_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/54015954567.pdf
    • https://cdn.shopify.com/s/files/1/0437/5176/8225/files/bedowukexowifas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/50570177687.pdf
    • https://cdn.shopify.com/s/files/1/0440/7764/5974/files/pizokimadedog.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004488.bin
f1f7a5df1cc2aa7c25a4a5d6cc3cff1b9e80a13d90b877da938b70af63c87faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4488 5176 bytes
font_01_sfnt_off0000563a.bin
ccd05f361fedf8b6499e76194302bc3f5f0616b8b677036ecf55f5bdc079a6c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x563A 9356 bytes

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