Malicious PDF — malware analysis report

Static analysis result for SHA-256 63caeacee6a5a328…

MALICIOUS

PDF

37.0 KB Created: 2020-08-03 04:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1cfcde9e0406f3aaf894dc583fb8d1 SHA-1: cfbad4d12e507625884ac72ff797d4ebf0f92cad SHA-256: 63caeacee6a5a328941d895f17947bf02727e5790a7f7a117b14b05407d3ffac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO spam operation. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly flagged the PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other Shopify links, indicating an attempt to drive traffic to potentially harmful 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.com/pify?keyword=christmas+canon+sheet+music+pdf
    • http://files.grcrowfamily.com/uploads/1/3/1/0/131070190/3426f7e.pdf
    • http://files.jamesmurdo.com/uploads/1/3/0/8/130874398/4b047b0d7bdda.pdf
    • http://files.stopabully.ca/uploads/1/3/1/8/131871569/7949dc6.pdf
    • http://files.thinkgrafix.net/uploads/1/3/0/8/130873877/likuwijolulel_pagipojiku_walovufew_bereru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6017/3717/files/ratonafur.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/animal_magnetism_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0431/5748/7778/files/sinotorakamaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/58895328841.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/tank_trouble_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/21444694434.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/32391443862.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/61644972264.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/71462296520.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/chilton_labor_guides.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6310/files/94663587057.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051a3.bin
737357c966aef9c284e8b639c49b275e32764c1fa5e5a89229ef1c8cf305592b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51A3 5268 bytes
font_01_sfnt_off00006357.bin
c7970d70d0d1b543b2a42e77e71fb361185540a3ea59754ee55670a9553672ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6357 10380 bytes

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