Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a76bc7570435b0c…

MALICIOUS

PDF

44.6 KB Created: 2020-08-15 07:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c7995589f2e6ca08178dea80e7612da SHA-1: fa7a8584f4d19694ce04bf8a0b216a3123b3f176 SHA-256: 4a76bc7570435b0c2b28eb8b4fbb79388bb8eeead3e1f753ae3a384f0c62c7f2
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for 'Fox tv guide schedule tonight' which redirects to a malicious URL. This indicates a phishing or social engineering attack. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier 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/pify?keyword=fox+tv+guide+schedule+tonight
    • http://files.amkmusic.com/uploads/1/3/1/1/131164046/jefejutavirit.pdf
    • http://files.unionchapelfwb.com/uploads/1/3/0/8/130814351/3050103.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/wenovevokukisus.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/29539376328.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/codices_latini_antiquiores.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/ccnp_security_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0445/2545/3471/files/campbell_biology_chapter_18.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4151/files/jimolak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/fafigogakuxejawefenazefij.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_off0000722a.bin
58800f91cf5a5a6dd37c9c2f3c7a835811bb5ec947d088d40a1b3e2ae5d3dd77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722A 4980 bytes
font_01_sfnt_off0000832b.bin
e57b370ca04f3de755b229ce298966405c51c8fd4ff3a3cf963f6d511e3ff707		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832B 10208 bytes

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