Malicious PDF — malware analysis report

Static analysis result for SHA-256 98efb87fbf07f373…

MALICIOUS

PDF

38.9 KB Created: 2020-08-16 22:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d014c3a53e3736c3ecbaab1e8fce2c14 SHA-1: baa480d67602120aa7c593184fbfc4a557e5fca9 SHA-256: 98efb87fbf07f373db790bedfc8440aa4750fbc2da30bbef535715d45db1c86f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to improve search engine ranking for malicious content. 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.ru/pify?keyword=beach+buggy+blitz+pc
    • http://files.u-tokai.dk/uploads/1/3/0/7/130739444/47d2736.pdf
    • http://wuzuwa.phdoodlesco.com/uploads/1/3/1/3/131383544/vakarubedalipega.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/88962511213.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/jiwomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7759/1449/files/essential_kanji_2000.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/ruzade.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/cervical_spine_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/spanish_english_visual_bilingual_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/fibuvulek.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/alexandrov_combinatorial_topology.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/65369857410.pdf
    • https://cdn.shopify.com/s/files/1/0439/2127/7096/files/total_gym_replacement_parts.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_off0000590f.bin
e7d3325ea724a46c4fcc54ccb9f8338050b2e5572d75396207fc087758c5df73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590F 5260 bytes
font_01_sfnt_off00006b03.bin
e6f7ca5f57d0516e8e96cfb2f6e9865ab7625905cb86f32d9ac60b820f25f0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B03 10712 bytes

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