Malicious PDF — malware analysis report

Static analysis result for SHA-256 35beb94e33b6b321…

MALICIOUS

PDF

35.1 KB Created: 2020-08-14 06:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 118c55413af35800f0b4b25146b54fb2 SHA-1: de7521a9763c023a1526cf92c2163fead35e7638 SHA-256: 35beb94e33b6b321517be20585dbb93bc61c4fa3b289ca2baaa2e1eb87f60221
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/wb?keyword=cafe%20del%20rio%20menu%20pdf`. This indicates the document is designed to redirect users to malicious infrastructure. The presence of numerous other PDF links, many hosted on `cdn.shopify.com`, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=cafe%20del%20rio%20menu%20pdf
    • http://files.theforestridge.org/uploads/1/3/1/0/131070469/4819326.pdf
    • http://files.midvalelincolnpto.org/uploads/1/3/1/4/131482808/xeruginegel-tavaz.pdf
    • http://files.findyourcenter-yoga.com/uploads/1/3/1/6/131606631/7244361.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/likufixadokunuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/79350587243.pdf
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/assembly_language_by_ytha_yu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/head_first_kotlin_a_brain-_friendly_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/64694342935.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/catechism_of_the_catholic_church_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/11708533423.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/59168645855.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/gojifonoxapoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/brochure_examples_for_travel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/adosphere_3_livre_du_professeur.pdf
    • https://cdn.shopify.com/s/files/1/0435/4031/6311/files/lijikumexav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/5288326152.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_off00004c1b.bin
477c8d7ae6f6af1937321d1d2ac5a0d4ab17d4f7487b272c8822613ea315ba67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1B 4916 bytes
font_01_sfnt_off00005cb7.bin
af102e01f29697dfe747ffc962cdc84522b04a8b380118231ffbb6a66975b1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB7 10128 bytes

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