Malicious PDF — malware analysis report

Static analysis result for SHA-256 966d4303bf3c73f2…

MALICIOUS

PDF

43.9 KB Created: 2020-08-24 10:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df7f7c6a8ef28426971ed00fb1cf401 SHA-1: b0d7342e4c5c89b0cf7ff8acc312e1a541df1aa7 SHA-256: 966d4303bf3c73f24859af774808a6841969c4df7c62361f7eaca925c60c8283
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.ru/pify?keyword=calma+remix+mp4+video. The document body contains garbled text and a reference to the same malicious URL, suggesting it's a lure. The presence of numerous links indicates an attempt to distribute malicious content or lead users to phishing 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=calma+remix+mp4+video
    • http://files.villijmedia.com/uploads/1/3/1/6/131606968/rimuk-rewisafap-dakupajipom.pdf
    • http://loguf.malineseedandfence.com/uploads/1/3/1/3/131380600/sodidiro-kexuxejoroza.pdf
    • http://fesisanox.kelsey-kane.com/uploads/1/3/1/4/131405965/4985488.pdf
    • http://files.pilgrim-medj.com/uploads/1/3/0/7/130740066/nobujatukonusularid.pdf
    • https://cdn.shopify.com/s/files/1/0431/3359/9893/files/convert_charsequence_to_string_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6414/files/biwazixodesojowofavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4601/8967/files/86939593037.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9829/files/doripafimorakagekis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/jamberry_7_day_challenge_card.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/legal_driving_age_in_california.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/tenevovut.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/negoxepiro.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/xadobukuvorere.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/research_articles_on_ratio_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/ferdinand_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e66.bin
7073b81e6f2df27369217376854307045f99d5fdeb7fcc43363cb1b877edd922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E66 5048 bytes
font_01_sfnt_off00005f8c.bin
672586270f2334fd182c9f36d65c2802cf6ef76fc6ad52c344d871060dcd2c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 10364 bytes
font_02_sfnt_off00008356.bin
1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8356 18776 bytes

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